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Quantum Cascade Lasers (QCLs): Distributed Feedback, Two-Tab C-Mount


  • Center Wavelengths Between 4.00 µm and 11.00 µm
  • Typical Output Power: 40 - 120 mW
  • Single-Wavelength Emission Tunable within 1 - 5 cm-1 Range
  • Shipped from Stock

QD9500CM1

Distributed Feedback Laser

(Linewidth Shown is Limited by Measurement Resolution)

Related Items


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MIR Laser Types
Fabry-Perot Two-Tab C-Mount
Distributed
Feedback
Two-Tab C-Mount
D-Mount
HHL
Webpage Features
info icon Clicking this icon opens a window that contains specifications and mechanical drawings.
info icon Clicking this icon allows you to download our standard support documentation.

Choose Item

Clicking the words "Choose Item" opens a drop-down list containing all of the in-stock lasers around the desired center wavelength. The red icon next to the serial number then allows you to download L-I-V and spectral measurements for that serial-numbered device.

Features

  • Single-Wavelength Distributed Feedback Quantum Cascade Lasers (QCLs)
  • Typical Output Power from 40 to 120 mW, Depending on Device
  • Center Wavelengths from 4.00 µm to 11.00 μm (Wavenumbers Between 2500 cm-1 and 909 cm-1)
  • Compact Two-Tab C-Mount Package: 6.4 mm x 4.3 mm x 7.9 mm (L x W x H)
  • Electrically Isolated from C-Mount
  • Custom Wavelengths and Mounts Also Available (Contact Tech Support for Details)

Thorlabs' Distributed Feedback Quantum Cascade Lasers (QCLs) emit at a well defined center wavelength and provide single spatial mode operation. By tuning the input current and operating temperature, the output frequency can be tuned over a narrow range between 1 cm-1 and 5 cm-1. These lasers are ideal for chemical sensing (see the Spectroscopy tab), optical communications, and other applications. Thorlabs also manufactures Fabry-Perot Quantum Cascade Lasers and Interband Cascade Lasers, which exhibit broadband emission.

Before shipment, the output spectrum, power, and L-I-V curve are measured for each serial-numbered device by an automated test station. These measurements are available below and are also included on a data sheet with the laser. These QCLs are specified for CW output. While pulsed output is possible, this application prohibits current tuning, and performance is not guaranteed. Please note that some optical power is emitted through the rear facet; this output is not usable in applications.

Packages
Each laser is mounted on a two-tab C-mount that provides high thermal conductivity and can be secured using a 2-56 or M2 screw with the counterbored Ø2.4 mm (Ø0.09") through hole. As measured from the bottom of the C-mount, the emission height is either 7.15 mm or 7.39 mm depending on the chosen laser. Click on a laser's blue info icon (info icon) below and click on the Drawing tab to find the laser's emission height. QCLs are electrically isolated from their C-mounts. Please see the Handling tab for more tips and information for handling these laser packages.

Mounts, Drivers, and Temperature Control
We generally recommend the LDMC20 C-Mount Laser Mount and ITC4002QCL or ITC4005QCL Dual Current / Temperature Controller for these lasers. This device combination includes all the necessary components to mount, drive, and thermally regulate a two-tab C-mount laser. Other compatible current and temperature controllers are listed in the Drivers tab.

If designing your own mounting solution, note that due to these lasers' heat loads, we recommend that they be mounted in a thermally conductive housing to prevent heat buildup. Heat loads for distributed feedback QCLs can be up to 14.2 W (see the Handling tab for additional information).

The typical operating voltage of distributed feedback QCLs is 9 - 14 V. These lasers do not have built-in monitor photodiodes and must be operated in constant current mode.

High-Power QCLs
Click to Enlarge

Available Wavelengths for Custom DFB Lasers

DFB QCLs at Custom Wavelengths

Thorlabs manufactures custom and OEM quantum cascade lasers in high volumes. We maintain chip inventory from 3 µm to 12 µm at our Jessup, Maryland laser manufacturing facility, and can deliver DFB lasers with custom center wavelengths that are qualified to a user-defined wavelength precision.

More details are available on the Custom & OEM Lasers tab. To inquire about pricing and availability, please contact us. A semiconductor specialist will contact you within 24 hours or the next business day.

Table Key
Current Controllers
Dual Current / Temperature Controllers

Use the tables below to select a compatible controller for our MIR lasers. The first table lists the controllers with which a particular MIR laser is compatible, and the second table contains selected information on each controller; complete information on each controller is available in its full web presentation. We particularly recommend our ITC4002QCL and ITC4005QCL controllers, which have high compliance voltages of 17 V and 20 V, respectively. Together, these drivers support the current and voltage requirements of our entire line of Mid-IR Lasers. To get L-I-V and spectral measurements of a specific, serial-numbered device, click "Choose Item" next to the part number below, then click on the Docs Icon next to the serial number of the device.

Laser Mount Compatibility
Thorlabs' LDMC20 C-Mount Laser Mount ships with current and TEC cables for the LDC4005, ITC4001, ITC4002QCL, ITC4005, and ITC4005QCL controllers. If designing your own mounting solution, note that due to these lasers' heat loads, we recommend that they be secured in a thermally conductive housing to prevent heat buildup. Heat loads for distributed feedback QCLs can be up to 14.2 W.

Laser and Controller Compatibility

Laser Item # Wavelength
(Wavenumbers)
Current Controllers Dual Current / Temperature Controllers
QD4500CM1 4.00 - 5.00 µm
(2500 - 2000 cm-1)
- ITC4002QCL, ITC4005QCL
QD4580CM1 4.54 - 4.62 µm
(2203 - 2165 cm-1)
LDC4005 ITC4002QCLITC4005ITC4005QCL
QD5500CM1 5.00 - 6.00 µm
(2000 - 1667 cm-1)
- ITC4002QCLITC4005QCL
QD5250CM1 5.20 - 5.30 µm
(1923 - 1887 cm-1)
LDC4005 ITC4002QCLITC4005ITC4005QCL
QD6500CM1 6.00 - 7.00 µm
(1667 - 1429 cm-1)
- ITC4002QCLITC4005QCL
QD7500CM1 7.00 - 8.00 µm
(1429 - 1250 cm-1)
- ITC4002QCLITC4005QCL
QD7950CM1 7.90 - 8.00 µm
(1266 - 1250 cm-1)
LDC4005 ITC4001, ITC4002QCLITC4005ITC4005QCL
QD8050CM1 8.00 - 8.10 µm
(1250 - 1235 cm-1)
LDC4005 ITC4001, ITC4002QCLITC4005ITC4005QCL
QD8500CM1 8.00 - 9.00 µm
(1250 - 1111 cm-1)
- ITC4002QCL, ITC4005QCL
QD8650CM1 8.60 - 8.70 µm
(1163 - 1149 cm-1)
LDC4005 ITC4001, ITC4002QCLITC4005ITC4005QCL
QD9500CM1 9.00 - 10.00 µm
(1111 - 1000 cm-1)
- ITC4002QCL, ITC4005QCL
QD9550CM1 9.50 - 9.60 µm
(1053 - 1042 cm-1)
LDC4005 ITC4002QCLITC4005ITC4005QCL
QD10500CM1 10.00 - 11.00 µm
(1000 - 909 cm-1)
- ITC4002QCL, ITC4005QCL

 

Controller Selection Guide

Controller Item # Controller Type Controller Package Current Range Current Resolution Voltage Cables for
LDMC20 Laser Mount
LDC4005 Current Large Benchtop
(263 x 122 x 307 mm)
0 to 5 A 1 mA (Front Panel)
80 µA (Remote Control)
12 V Included with LDMC20
ITC4001 Current / Temperature Large Benchtop
(263 x 122 x 307 mm)
0 to 1 A 100 µA (Front Panel)
16 µA (Remote Control)
11 V Included with LDMC20
ITC4002QCL 0 to 2 A 100 µA (Front Panel)
32 µA (Remote Control)
17 V Included with LDMC20
ITC4005 0 to 5 A 1 mA (Front Panel)
80 µA (Remote Control)
12 V Included with LDMC20
ITC4005QCL 20 V Included with LDMC20

Do

  • Provide External Temperature Regulation
    (e.g., Heat Sinks, Fans, and/or Water Cooling)
  • Use a Constant Current Source Specifically Designed for Lasers
  • Observe Static Avoidance Practices
  • Be Careful When Making Electrical Connections

Do Not

  • Use Thermal Grease
  • Expose the Laser to Smoke, Dust, Oils, Adhesive Films, or Flux Fumes
  • Blow on the Laser
  • Drop the Laser Package

Handling Two-Tab C-Mount Lasers

Proper precautions must be taken when handling and using two-tab C-mount lasers. Otherwise, permanent damage to the device will occur. Members of our Technical Support staff are available to discuss possible operation issues.

Avoid Static
Since these lasers are sensitive to electrostatic shock, they should always be handled using standard static avoidance practices.

Avoid Dust and Other Particulates
Unlike TO can and butterfly packages, the laser chip of a two-tab C-mount laser is exposed to air; hence, there is no protection for the delicate laser chip. Contamination of the laser facets must be avoided. Do not blow on the laser or expose it to smoke, dust, oils, or adhesive films. The laser facet is particularly sensitive to dust accumulation. During standard operation, dust can burn onto this facet, which will lead to premature degradation of the laser. If operating a two-tab C-mount laser for long periods of time outside a cleanroom, it should be sealed in a container to prevent dust accumulation.

Use a Current Source Specifically Designed for Lasers
These lasers should always be used with a high-quality constant current driver specifically designed for use with lasers, such as any current controller listed in the Drivers tab. Lab-grade power supplies will not provide the low current noise required for stable operation, nor will they prevent current spikes that result in immediate and permanent damage.

Thermally Regulate the Laser
Temperature regulation is required to operate the laser for any amount of time. The temperature regulation apparatus should be rated to dissipate the maximum heat load that can be drawn by the laser. For our interband cascade lasers, this value is up to 2.5 W, while for our quantum cascade lasers, it can be up to 18 W. The LDMC20 C-Mount Laser Mount, which is compatible with our two-tab C-mount lasers, is rated for >20 W of heat dissipation.

The back face of the C-mount package is machined flat to make proper thermal contact with a heat sink. Ideally, the heat sink will be actively regulated to ensure proper heat conduction. A Thermoelectric Cooler (TEC) is well suited for this task and can easily be incorporated into any standard PID controller.

A fan may serve to move the heat away from the TEC and prevent thermal runaway. However, the fan should not blow air on or at the laser itself. Water cooling methods may also be employed for temperature regulation. Do not use thermal grease with this package, as it can creep, eventually contaminating the laser facet. Pyrolytic graphite is an acceptable alternatives to thermal grease for these packages. Solder can also be used to thermally regulate two-tab C-mount lasers, although controlling the thermal resistance at the interface is important for best results.

Carefully Make Electrical Connections
When making electrical connections, care must be taken. The flux fumes created by soldering can cause laser damage, so care must be taken to avoid this. Solder can be avoided entirely for two-tab C-mount lasers by using the LDMC20 C-Mount Laser Mount. If soldering to the tabs, solder with the C-mount already attached to a heat sink to avoid unnecessary heating of the laser chip.

Minimize Physical Handling
As any interaction with the package carries the risk of contamination and damage, any movement of the laser should be planned in advance and carefully carried out. It is important to avoid mechanical shocks. Dropping the laser package from any height can cause the unit to permanently fail.

Choosing a Collimating Lens

Since the output of our MIR lasers is highly divergent, collimating optics are necessary. Aspheric lenses, which are corrected for spherical aberration, are commonly chosen when the desired beam diameter is between 1 - 5 mm. The simple example below illustrates the key specifications to consider when choosing the correct lens for a given application.

Example

  • Center Wavelength: 3.80 µm
  • Laser Item #: IF3800CM2
  • Desired Collimated Beam Diameter: 4 mm (Major Axis)

The specifications for the IF3800CM2 indicate that the typical parallel and perpendicular FWHM divergences are 40° and 60°, respectively. Therefore, as the light propagates, an elliptical beam will result. To collect as much light as possible during the collimation process, consider the larger of these two divergence angles in your calculations (in this case, 60°).

laser diode collimation drawing
θ = Divergence Angle
Ø = Beam Diameter

Using the information above, the focal length needed to obtain the desired beam diameter can be calculated:

focal length calculation

This information allows the appropriate collimating lens to be selected. Thorlabs offers a large selection of black diamond aspheric lenses for the mid-IR spectral range. Since this laser emits at 3.80 µm, the best AR coating is our -E coating, which provides Ravg < 0.6% per surface from 3 to 5 µm. The lenses with focal lengths closest to the calculated value of 3.46 mm are our 390036-E (unmounted) or C036TME-E (mounted) Molded Aspheric Lenses, which have f = 4.00 mm. Plugging this focal length back into the equation shown above gives a final beam diameter of 4.62 mm along the major axis.

Next, we verify that the numerical aperture (NA) of the lens is larger than the NA of the laser:

NALens = 0.56

NALaser ~ sin (30°) = 0.5

NALens > NALaser

Since NALens > NALaser, the 390036-E or C036TME-E lenses will give acceptable beam quality. However, by using the FWHM beam diameter, we have not accounted for a significant fraction of the beam power. A better practice is to use the 1/e2 beam diameter. For a Gaussian beam profile, the 1/e2 beam diameter is approximately equal to 1.7X the FWHM diameter. The 1/e2 beam diameter is therefore a more conservative estimate of the beam size, containing more of the laser's intensity. Using this value significantly reduces far-field diffraction (since less of the incident light is clipped) and increases the power delivered after the lens.

A good rule of thumb is to pick a lens with an NA of twice the NA of the laser diode. For example, either the 390037-E or the C037TME-E could be used as these lenses each have an NA of 0.85, which a little less than twice that of our IF3800CM2 laser (NA 0.5). Compared to the first set of lenses we identified, these have a shorter focal length of 1.873 mm, resulting in a smaller final beam diameter of 2.16 mm.

Beam Profile Characterization of a Mid-IR Laser

Because quantum cascade lasers (QCLs) and interband cascade lasers (ICLs) have intrinsically large divergence angles, it is necessary to install collimating optics in front of the laser face, as shown in the Collimation tab. We are frequently asked what beam quality can be reasonably expected once the beam has been collimated. This tab presents an M2 measurement we performed using our 3.80 µm Interband Cascade Laser (Item # IF3800CM2).

For this system, we obtained M= 1.2 ± 0.08 in the parallel direction and M= 1.3 ± 0.2 in the perpendicular direction. While this is just one example, we believe these results to be representative of well-collimated mid-IR lasers manufactured by Thorlabs, as corroborated by supplementary measurements we have performed in-house.

Experimental Setup

Pyroelectric Camera Upstream of Focus
Click to Enlarge

Pyroelectric Camera Upstream of Focus
Pyroelectric Camera Downstream of Focus
Click to Enlarge

Pyroelectric Camera Downstream of Focus

The apparatus we used to determine M2 is shown schematically in the figure above. In order to ensure that our results were rigorous, all data acquisition and analysis were consistent with the ISO11146 standard.

The IF3800CM2 Interband Cascade Laser used for this measurement emitted CW laser light with a center wavelength of 3.781 µm. Our LDMC20 temperature-stabilized mount held the laser's temperature at 25 °C. The output beam was collimated by a C037TME-E lens located immediately downstream of the laser face. This lens was selected because of its large NA of 0.85 (which helped maximize collection of the emitted light) and because of its AR coating (Ravg < 0.6% per surface from 3 µm to 5 µm). We measured 10 mW of output power after the lens.

A pyroelectric camera (Spiricon Pyrocam IV) with 80 µm square pixels was scanned along the beam propagation direction, and the beam width was measured along the parallel and perpendicular directions using the second-order moment (D4σ) definition. Hyperbolas were fit to the beam width to extract M2 for each direction. The camera's internal chopper was triggered at 50 Hz since the pyroelectric effect is sensitive to changes in temperature rather than absolute temperature differences. A ZnSe window was present in front of the detector array to help minimize visible light contributions to the signal.

Beam Profile Measurement
Click to Enlarge

D4σ Beam Width of Collimated IF3800CM2 Laser

Data Analysis
Presented to the right are the second-order moment (D4σ) beam widths for the parallel and perpendicular directions as a function of distance from the laser face (denoted as z). Along the parallel direction, we obtained a minimum beam width of 1.5 mm, while along the perpendicular direction, we obtained a minimum beam width of 1.3 mm. The spatial profiles we observed at the two minimum beam width positions, as obtained by the pyroelectric camera, are shown below.

The divergence of the beam can be described by a hyperbola, as written in Equation 1:

Hyperbola for M^2 Equation (Eq. 1)

In order to obtain the hyperbola coefficients a, b, and c for the parallel and perpendicular directions, we fit the discrete beam width measurements along each direction to hyperbolas, as shown in the graph to the right. These coefficients were substituted into Equation 2 (taking λ = 3.781 µm) to yield M2.

M^2 Equation (Eq. 2)

The hyperbola coefficients and M2 values derived by this method are listed in the table below.

Value Parallel Perpendicular
a 3.6 ± 0.1 mm2 9.7 ± 0.2 mm2
b -0.0096 ± 0.0007 mm -0.0268 ± 0.0008 mm
c (1.61 ± 0.08) × 10-5 (2.27 ± 0.08) × 10-5
M2 1.2 ± 0.08 1.3 ± 0.2

The 0.85 NA of the collimating lens we used is the largest NA of any lens for this wavelength range that is offered in our catalog. Despite this large NA, we observed lobes in the far field (shown by the figure below) that are consistent with clipping of the laser-emitted light. An ideal measurement would not contain these artifacts.

As shown by the graph above and to the right, we observed significant astigmatism in the collimated beam: the beam waist of the parallel direction occurred around z = 300 mm, while the beam waist of the perpendicular direction occurred around z = 600 mm. This astigmatism corresponds closely to what is expected for this laser, given that the IF3800CM2 laser is specified with a parallel FWHM beam divergence of 40° and a perpendicular FWHM beam divergence of 60°.

Beam Profile from Pyrocam
Beam Profile at Beam Waist of Parallel Direction
(Each Pixel is 80 µm Square)
Beam Profile from Pyrocam
Beam Profile at Beam Waist of Perpendicular Direction
(Each Pixel is 80 µm Square)
Selected Distributed Feedback QCLsa
Item # Nominal Center Frequency Targeted Gas(es)
QD9550CM1 1047 cm-1 (9.55 µm) NH3 (Ammonia)
QD8650CM1 1156 cm-1 (8.65 µm) O3 (Ozone)
SO2 (Sulfur Dioxide)
QD8050CM1 1242 cm-1 (8.05 µm) CH4 (Methane)
HONO (Nitrous Acid)
QD7950CM1 1258 cm-1 (7.95 µm) CH4 (Methane)
HONO (Nitrous Acid)
QD5250CM1 1905 cm-1 (5.25 µm) NO (Nitric Oxide)
QD4580CM1 2183 cm-1 (4.58 µm) CO (Carbon Monoxide)
N2O (Nitrous Oxide)
  • This table is intended as a reference. Each DFB QCL is a unique device with its own spectrum, and does not necessarily emit at the exact absorption line required for a given experiment. To verify that the QCL you receive will meet your needs, please download its data sheet. Click "Choose Item" below, then click on the Docs icon (Docs Icon) next to the serial number of the laser.

Gas-Phase Spectroscopy Using Distributed Feedback Lasers

Distributed Feedback Quantum Cascade Lasers (DFB QCLs) offer many attractive features for spectroscopy. They emit at a single wavelength within the mid-IR, where many gaseous species characteristically absorb. Moreover, their emission wavelength is easily tuned (typical tuning range: 1 - 5 cm-1) by changing the drive current and operating temperature of the laser, making them ideal for isolating narrow gas absorption lines. Finally, they offer relatively high output power (typically 40 - 120 mW at rollover current), helping improve measurement sensitivity.

Thorlabs' DFB QCLs emit at wavelengths that range from 4.00 to 11.00 µm (2500 cm-1 to 909 cm-1). If we do not stock the wavelength required for your application, custom wavelengths are available by contacting Tech Support.

The tuning range of individual DFB QCLs depends greatly on the actual laser device. Each DFB QCL is a unique device with its own threshold current, rollover current, and spectrum. With typical lasers, it is usually preferable to operate the laser at or near the rollover current, since the output power is lowest at threshold and highest at rollover. On the other hand, the wavelength of DFB QCLs changes as a function of the current, so operating at the rollover current is not always possible in spectroscopy measurements, which require specific wavelengths. (It is important to note that the output power is not constant over the entire tuning range.)

 

Tuning Example
To demonstrate DFB QCLs' tunability, we measured the center wavelength of a QD4580CM1 laser as a function of drive current, from threshold to near rollover, at 15 °C and 25 °C. Over the entire temperature and drive current range, we obtained center wavelengths from 4.568 µm to 4.586 µm (2189.14 cm-1 to 2180.77 cm-1), spanning a range of 18 nm (8.37 cm-1), with output power ranging from 3.2 mW (at threshold current) to 39.1 mW (at near-rollover current). Since the laser is capable of operating at 35 °C, even broader wavelength tuning is also achievable.

DFB QCL Temperature Tuning
Click to Enlarge

DFB QCL Center Frequency as Function of Temperature and Drive Current
Sample QD4580CM1 Spectrum and Output Power
Current 15 °C 25 °C
Center Frequency Output
Power
Center Frequency Output
Power
300 mA 2189.14 cm-1 (4.568 µm) 8.4 mW 2187.34 cm-1 (4.572 µm) 3.2 mW
350 mA 2188.12 cm-1 (4.570 µm) 19.6 mW 2186.26 cm-1 (4.574 µm) 11.9 mW
400 mA 2186.92 cm-1 (4.573 µm) 28.3 mW 2185.05 cm-1 (4.577 µm) 18.9 mW
450 mA 2185.71 cm-1 (4.575 µm) 33.7 mW 2183.78 cm-1 (4.579 µm) 23.5 mW
500 mA 2184.33 cm-1 (4.578 µm) 37.1 mW 2182.34 cm-1 (4.582 µm) 26.6 mW
550 mA 2182.76 cm-1 (4.581 µm) 39.1 mW 2180.77 cm-1 (4.586 µm) 28.2 mW

ECL, DFB, VHG-Stabilized, and DBR Single-Frequency Lasers

ECL Laser Diagram
Click to Enlarge

Figure 1: ECL Lasers have a Grating Outside of the Gain Chip

A wide variety of applications require tunable single-frequency operation of a laser system. In the world of diode lasers, there are currently four main configurations to obtain a single-frequency output: external cavity laser (ECL), distributed feedback (DFB), volume holographic grating (VHG), and distributed Bragg reflector (DBR). All four are capable of single-frequency output through the utilization of grating feedback. However, each type of laser uses a different grating feedback configuration, which influences performance characteristics such as output power, tuning range, and side mode suppression ratio (SMSR). We discuss below some of the main differences between these four types of single-frequency diode lasers.

External Cavity Laser
The External Cavity Laser (ECL) is a versatile configuration that is compatible with most standard free space diode lasers. This means that the ECL can be used at a variety of wavelengths, dependent upon the internal laser diode gain element. A lens collimates the output of the diode, which is then incident upon a grating (see Figure 1). The grating provides optical feedback and is used to select the stabilized output wavelength. With proper optical design, the external cavity allows only a single longitudinal mode to lase, providing single-frequency laser output with high side mode suppression ratio (SMSR > 45 dB).

One of the main advantages of the ECL is that the relatively long cavity provides extremely narrow linewidths (<1 MHz). Additionally, since it can incorporate a variety of laser diodes, it remains one of the few configurations that can provide narrow linewidth emission at blue or red wavelengths. The ECL can have a large tuning range (>100 nm) but is often prone to mode hops, which are very dependent on the ECL's mechanical design as well as the quality of the antireflection (AR) coating on the laser diode.

DBR Laser Diagram
Click to Enlarge

Figure 2: DFB Lasers Have a Bragg Reflector Along the Length of the Active Gain Medium

Distributed Feedback Laser
The Distributed Feedback (DFB) Laser (available in NIR and MIR) incorporates the grating within the laser diode structure itself (see Figure 2). This corrugated periodic structure coupled closely to the active region acts as a Bragg reflector, selecting a single longitudinal mode as the lasing mode. If the active region has enough gain at frequencies near the Bragg frequency, an end reflector is unnecessary, relying instead upon the Bragg reflector for all optical feedback and mode selection. Due to this “built-in” selection, a DFB can achieve single-frequency operation over broad temperature and current ranges. To aid in mode selection and improve manufacturing yield, DFB lasers often utilize a phase shift section within the diode structure as well.

The lasing wavelength for a DFB is approximately equal to the Bragg wavelength:

DBR Equation

where λ is the wavelength, neff is the effective refractive index, and Λ is the grating period. By changing the effective index, the lasing wavelength can be tuned. This is accomplished through temperature and current tuning of the DFB.

The DFB has a relatively narrow tuning range: about 2 nm at 850 nm, about 4 nm at 1550 nm, or at least 1 cm-1 in the mid-IR (4.00 - 11.00 µm). However, over this tuning range, the DFB can achieve single-frequency operation, which means that this is a continuous tuning range without mode hops. Because of this feature, DFBs have become a popular and majority choice for real-world applications such as telecom and sensors. Since the cavity length of a DFB is rather short, the linewidths are typically in the 1 MHz to 10 MHz range. Additionally, the close coupling between the grating structure and the active region results in lower maximum output power compared to ECL and DBR lasers.

DBR Laser Diagram
Click to Enlarge

Figure 3: VHG Lasers have a Volume Holographic Grating Outside of the Active Gain Medium

Volume-Holographic-Grating-Stabilized Laser
A Volume-Holographic-Grating-(VHG)-Stabilized Laser also uses a Bragg reflector, but in this case a transmission grating is placed in front of the laser diode output (see Figure 3). Since the grating is not part of the laser diode structure, it can be thermally decoupled from the laser diode, improving the wavelength stability of the device. The grating typically consists of a piece of photorefractive material (typically glass) which has a periodic variation in the index of refraction. Only the wavelength of light that satisfies the Bragg condition for the grating is reflected back into the laser cavity, which results in a laser with extremely wavelength-stable emission. A VHG-Stabilized laser can produce output with a similar linewidth to a DFB laser at higher powers that is wavelength-locked over a wide range of currents and temperatures.

DBR Laser Diagram
Click to Enlarge

Figure 4: DBR Lasers have a Bragg Reflector Outside of the Active Gain Medium

Distributed Bragg Reflector Laser
Similar to DFBs, Distributed Bragg Reflector (DBR) lasers incorporate an internal grating structure. However, whereas DFB lasers incorporate the grating structure continuously along the active region (gain region), DBR lasers place the grating structure(s) outside this region (see Figure 4). In general a DBR can incorporate various regions not typically found in a DFB that yield greater control and tuning range. For instance, a multiple-electrode DBR laser can include a phase-controlled region that allows the user to independently tune the phase apart from the grating period and laser diode current. When utilized together, the DBR can provide single-frequency operation over a broad tuning range. For example, high end sample-grating DBR lasers can have a tuning range as large as 30 - 40 nm. Unlike the DFB, the output is not mode hop free; hence, careful control of all inputs and temperature must be maintained.

In contrast to the complicated control structure for the multiple-electrode DBR, a simplified version of the DBR is engineered with just one electrode. This single-electrode DBR eliminates the complications of grating and phase control at the cost of tuning range. For this architecture type, the tuning range is similar to a DFB laser but will mode hop as a function of the applied current and temperature. Despite the disadvantage of mode hops, the single-electrode DBR does provide some advantages over its DFB cousin, namely higher output power because the grating is not continuous along the length of the device. Both DBR and DFB lasers have similar laser linewidths. Currently, Thorlabs offers only single-electrode DBR lasers.

Conclusion
ECL, DFB, VHG, and DBR laser diodes provide single-frequency operation over their designed tuning range. The ECL can be designed for a larger selection of wavelengths than either the DFB or DBR. While prone to mode hops, it also provides the narrowest linewidth (<1 MHz) of the three choices. In appropriately designed instruments, ECLs can also provide extremely broad tuning ranges (>100 nm).

The DFB laser is the most stable single-frequency, tunable laser of the four. It can provide mode-hop-free performance over its entire tuning range, making it one of the most popular forms of single-frequency laser for much of industry. It has the lowest output power due to inherent properties of the continuous grating feedback structure.

The VHG laser provides the most stable wavelength performance over a range of temperatures and currents and can provide higher powers than are typical in DFB lasers. This stability makes it excellent for use in OEM applications.

The single-electrode DBR laser provides similar linewidth and tuning range as the DFB (<5 nm). However, the single-electrode DBR will have periodic mode hops in its tuning curve.

Laser Packages of QCLs
Click to Enlarge

Some of Our Available Packages
Wire Bonding
Click for Details

Wire Bonding a Quantum Cascade Laser on a C-Mount

Custom & OEM Quantum Cascade and Interband Cascade Lasers

At our semiconductor manufacturing facility in Jessup, Maryland, we build a wide range of mid-IR lasers and gain chips. Our engineering team performs in-house epitaxial growth, wafer fabrication, and laser packaging. We maintain chip inventory from 3 µm to 12 µm, and our vertically integrated facilities are well equipped to fulfill unique requests.

High-Power Fabry-Perot QCLs
For Fabry-Perot lasers, we can reach multi-watt output power on certain custom orders. The available power depends upon several factors, including the wavelength and the desired package.

DFB QCLs at Custom Wavelengths
For distributed feedback (DFB) lasers, we can deliver a wide range of center wavelengths with user-defined wavelength precision. Our semiconductor specialists will take your application requirements into account when discussing the options with you.

The graphs below and photos to the right illustrate some of our custom capabilities. Please visit our semiconductor manufacturing capabilities presentation to learn more.

Contact Thorlabs

Custom QCL Wavelengths
Click to Enlarge

Available Wavelengths for Custom QCLs and ICLs
High-Power QCLs
Click to Enlarge

Maximum Output Power of Custom Fabry-Perot QCLs
QCL Gain Chips
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Electroluminescence Spectra of Available Gain Chip Material

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Posted Comments:
Poster:j.murray
Posted Date:2014-08-29 07:08:14.427
Dear Sir/Madam, I would like some information on the QD9550CM1 quantum cascade laser. Specifically I would like to know what the laser line width is so this device. The information suggest the profile shown is limited by the measurement. For my use I would like a line width of order 0.05cm-1. Kind regards, Jon.
Poster:jlow
Posted Date:2014-08-29 02:23:02.0
Response from Jeremy at Thorlabs: The actual line width of the DFB QCL is indeed much lower than the graph shown on the website. From previous testing, it should be <25MHz (the limit of our measurement system).

The rows shaded green below denote single-frequency lasers.

Item #WavelengthOutput
Power
Operating
Current
Operating
Voltage
Beam
Divergence
Spatial
Mode
Package
ParallelPerpendicular
L375P70MLD375 nm70 mW110 mA5.4 V22.5°Single ModeØ5.6 mm
L404P400M404 nm400 mW370 mA4.9 V13° (1/e2)42° (1/e2)MultimodeØ5.6 mm
LP405-SF10405 nm10 mW50 mA5.0 V--Single ModeØ5.6 mm, SM Pigtail
L405P20405 nm20 mW38 mA4.8 V8.5°19°Single ModeØ5.6 mm
LP405-SF30405 nm30 mW100 mA4.8 V--Single ModeØ5.6 mm, SM Pigtail
DL5146-101S405 nm40 mW70 mA5.2 V19°Single ModeØ5.6 mm
LP405-MF80405 nm80 mW85 mA5.0 V--MultimodeØ5.6 mm, MM Pigtail
LP405-MF300405 nm300 mW350 mA4.5 V--MultimodeØ5.6 mm, MM Pigtail
LP406-SF20406 nm20 mW75 mA4.8 V--Single ModeØ5.6 mm, SM Pigtail
LP450-SF15450 nm15 mW85 mA5.5 V--Single ModeØ9 mm, SM Pigtail
PL450B450 nm80 mW100 mA5.8 V4 - 11°18 - 25°Single ModeØ3.8 mm
L462P1400MM462 nm1400 mW1350 mA5 V5 - 25°35 - 50°MultimodeØ9 mm
LP462-MF1W462 nm1000 mW1100 mA5.0 V--MultimodeØ9 mm, MM Pigtail
LP473-SF6473 nm6 mW80 mA5.0 V--Single ModeØ5.6 mm, SM Pigtail
LP488-SF20488 nm20 mW70 mA6.0 V--Single ModeØ5.6 mm, SM Pigtail
L488P60488 nm60 mW75 mA6.8 V723Single ModeØ5.6 mm
LP520-SF15520 nm15 mW140 mA6.5 V--Single ModeØ9 mm, SM Pigtail
L520P50520 nm45 mW150 mA7.0 V22°Single ModeØ5.6 mm
PL520520 nm50 mW150 mA7.0 V22°Single ModeØ3.8 mm
LP520-MF100520 nm100 mW320 mA6.0 V--MultimodeØ5.6 mm, MM Pigtail
DJ532-10532 nm10 mW220 mA1.9 V0.69°0.69°Single ModeØ9.5 mm (non-standard)
DJ532-40532 nm40 mW330 mA1.9 V0.69°0.69°Single ModeØ9.5 mm (non-standard)
HL63163DG633 nm100 mW170 mA2.6 V8.5°18°Single ModeØ5.6 mm
LPS-635-FC635 nm2.5 mW70 mA2.2 V--Single ModeØ9.5 mm, SM Pigtail
LPS-PM635-FC635 nm2.5 mW70 mA2.2 V--Single ModeØ9.5 mm, PM Pigtail
L635P5635 nm5 mW30 mA<2.7 V32°Single ModeØ5.6 mm
HL6312G635 nm5 mW55 mA<2.7 V31°Single ModeØ9 mm
LPM-635-SMA635 nm8 mW50 mA2.2 V--MultimodeØ9 mm, MM Pigtail
LP635-SF8635 nm8 mW60 mA2.3 V--Single ModeØ5.6 mm, SM Pigtail
HL6320G635 nm10 mW70 mA<2.7 V31°Single ModeØ9 mm
HL6322G635 nm15 mW85 mA<2.7 V30°Single ModeØ9 mm
L637P5637 nm5 mW20 mA<2.4 V34°Single ModeØ5.6 mm
LP637-SF70637 nm70 mW220 mA2.7 V--Single ModeØ5.6 mm, SM Pigtail
HL63142DG637 nm100 mW140 mA2.7 V18°Single ModeØ5.6 mm
HL63133DG637 nm170 mW250 mA2.8 V17°Single ModeØ5.6 mm
HL6388MG637 nm250 mW340 mA2.3 V10°40°MultimodeØ5.6 mm
L638P040638 nm40 mW92 mA2.4 V10°21°Single ModeØ5.6 mm
L638P700M638 nm700 mW820 mA2.2 V35°MultimodeØ5.6 mm
HL6358MG639 nm10 mW40 mA2.3 V21°Single ModeØ5.6 mm
HL6323MG639 nm30 mW95 mA2.3 V8.5°30°Single ModeØ5.6 mm
HL6362MG640 nm40 mW90 mA2.4 V10°21°Single ModeØ5.6 mm
LP642-SF20642 nm20 mW90 mA2.5 V--Single ModeØ5.6 mm, SM Pigtail
LP642-PF20642 nm20 mW90 mA2.5 V--Single ModeØ5.6 mm, PM Pigtail
HL6364DG642 nm60 mW125 mA2.5 V10°21°Single ModeØ5.6 mm
HL6366DG642 nm80 mW155 mA2.5 V10°21°Single ModeØ5.6 mm
HL6385DG642 nm150 mW280 mA2.6 V17°Single ModeØ5.6 mm
L650P007650 nm7 mW28 mA2.2 V28°Single ModeØ5.6 mm
LPS-660-FC658 nm7.5 mW65 mA2.6 V--Single ModeØ5.6 mm, SM Pigtail
LP660-SF20658 nm20 mW80 mA2.6 V--Single ModeØ5.6 mm, SM Pigtail
LPM-660-SMA658 nm22.5 mW65 mA2.6 V--MultimodeØ5.6 mm, MM Pigtail
HL6501MG658 nm30 mW65 mA2.6 V8.5°22°Single ModeØ5.6 mm
L658P040658 nm40 mW75 mA2.2 V10°20°Single ModeØ5.6 mm
LP660-SF40658 nm40 mW135 mA2.5 V--Single ModeØ5.6 mm, SM Pigtail
LP660-SF60658 nm60 mW210 mA2.4 V--Single ModeØ5.6 mm, SM Pigtail
HL6544FM660 nm50 mW115 mA2.3 V10°17°Single ModeØ5.6 mm
HL6545MG660 nm120 mW170 mA2.45 V10°17°Single ModeØ5.6 mm
L660P120660 nm120 mW175 mA2.5 V10°17°Single ModeØ5.6 mm
LPS-675-FC670 nm2.5 mW55 mA2.2 V--Single ModeØ9 mm, SM Pigtail
HL6748MG670 nm10 mW30 mA2.2 V25°Single ModeØ5.6 mm
HL6714G670 nm10 mW55 mA<2.7 V22°Single ModeØ9 mm
HL6756MG670 nm15 mW35 mA2.3 V24°Single ModeØ5.6 mm
SLD1332V670 nm500 mW800 mA2.4 V23°MultimodeØ9 mm
LP685-SF15685 nm15 mW55 mA2.1 V--Single ModeØ5.6 mm, SM Pigtail
HL6750MG685 nm50 mW75 mA2.3 V21°Single ModeØ5.6 mm
HL6738MG690 nm30 mW90 mA2.5 V8.5°19°Single ModeØ5.6 mm
LP705-SF15705 nm15 mW55 mA2.3 V--Single ModeØ5.6 mm, SM Pigtail
HL7001MG705 nm40 mW75 mA2.5 V18°Single ModeØ5.6 mm
HL7302MG730 nm40 mW75 mA2.5 V18°Single ModeØ5.6 mm
L780P010780 nm10 mW24 mA1.8 V30°Single ModeØ5.6 mm
LP780-SAD15780 nm15 mW180 mA2.2 V--Single ModeØ9 mm, SM Pigtail
L785P5785 nm5 mW28 mA1.9 V10°29°Single ModeØ5.6 mm
LPS-PM785-FC785 nm6.25 mW65 mA---Single ModeØ5.6 mm, PM Pigtail
LPS-785-FC785 nm10 mW65 mA1.85 V--Single ModeØ5.6 mm, SM Pigtail
LP785-SF20785 nm20 mW85 mA1.9 V--Single ModeØ5.6 mm, SM Pigtail
DBR785S785 nm22 mW230 mA2.0 V--Single ModeSM, Butterfly
DBR785P785 nm22 mW230 mA2.0 V--Single ModePM, Butterfly
L785P25785 nm25 mW45 mA1.9 V30°Single ModeØ5.6 mm
LP785-SAV50785 nm50 mW500 mA2.2 V--Single ModeØ9 mm, SM Pigtail
L785P090785 nm90 mW120 mA2.0 V16°Single ModeØ5.6 mm
LP785-SF100785 nm100 mW300 mA2.0 V--Single ModeØ9 mm, SM Pigtail
FPL785S-250785 nm250 mW (Min)500 mA2.0 V--Single ModeSM Butterfly
FPL785P-200785 nm200 mW (Min)450 mA2.0 V--Single ModePM Butterfly
LD785-SEV300785 nm300 mW500 mA (Max)2.0 V16°Single ModeØ9 mm
LD785-SH300785 nm300 mW400 mA2.0 V18°Single ModeØ9 mm
FPL785C785 nm300 mW400 mA2.0 V18°Single Mode3 mm x 5 mm Submount
FPL785CM785 nm300 mW400 mA2.0 V18°Single ModeC-Mount
LD785-SE400785 nm400 mW550 mA2.0 V16°Single ModeØ9 mm
ML620G40805 nm500 mW650 mA1.9 V34°MultimodeØ5.6 mm
L808P010808 nm10 mW50 mA2 V10°30°Single ModeØ5.6 mm
LP808-SF30808 nm30 mW110 mA1.8 V--Single ModeØ5.6 mm, SM Pigtail
L808P030808 nm30 mW65 mA2 V10°30°Single ModeØ5.6 mm
LP808-SA40808 nm40 mW140 mA2.0 V--Single ModeØ9 mm, SM Pigtail
LD808-SA60808 nm60 mW100 mA2.0 V24°Single ModeØ5.6 mm
LD808-SA100808 nm100 mW145 mA2.0 V24°Single ModeØ9 mm
M9-808-0150808 nm150 mW180 mA1.9 V17°Single ModeØ9 mm
L808P200808 nm200 mW260 mA2 V10°30°MultimodeØ5.6 mm
LD808-SEV500808 nm500 mW800 mA (Max)2.2 V14°Single ModeØ9 mm
LD808-SE500808 nm500 mW750 mA2.2 V14°Single ModeØ9 mm
L808P500MM808 nm500 mW650 mA1.8 V12°30°MultimodeØ5.6 mm
L808P1000MM808 nm1000 mW1100 mA2 V30°MultimodeØ9 mm
L820P100820 nm100 mW145 mA2.1 V17°Single ModeØ5.6 mm
L820P200820 nm200 mW250 mA2.4 V17°Single ModeØ5.6 mm
LPS-830-FC830 nm10 mW120 mA---Single ModeØ5.6 mm, SM Pigtail
LPS-PM830-FC830 nm10 mW120 mA---Single ModeØ5.6 mm, PM Pigtail
LP830-SF30830 nm30 mW115 mA1.9 V--Single ModeØ9 mm, SM Pigtail
HL8338MG830 nm50 mW75 mA1.9 V22°Single ModeØ5.6 mm
L830P200830 nm200 mW210 mA2.1 V18°Single ModeØ9 mm
LD830-SE650830 nm650 mW900 mA2.3 V13°Single ModeØ9 mm
LD830-MA1W830 nm1 W1.330 A2.1 V24°MultimodeØ9 mm
LD830-ME2W830 nm2 W3 A (Max)2.0 V21°MultimodeØ9 mm
L850P010850 nm10 mW50 mA2 V10°30°Single ModeØ5.6 mm
L850P030850 nm30 mW65 mA2 V8.5°30°Single ModeØ5.6 mm
LP852-SF30852 nm30 mW115 mA1.9 V--Single ModeØ9 mm, SM Pigtail
DBR852S852 nm40 mW140 mA2.0 V--Single ModeSM, Butterfly
DBR852P852 nm40 mW140 mA2.0 V--Single ModePM, Butterfly
L852P50852 nm50 mW75 mA1.9 V22°Single ModeØ5.6 mm
L852P100852 nm100 mW120 mA1.9 V18°Single ModeØ9 mm
L852P150852 nm150 mW170 mA1.9 V18°Single ModeØ9 mm
LD852-SE600852 nm600 mW950 mA2.3 V7° (1/e2)13° (1/e2)Single ModeØ9 mm
LD852-SEV600852 nm600 mW1050 mA (Max)2.2 V13° (1/e2)Single ModeØ9 mm
LP880-SF3880 nm3 mW25 mA2.2 V--Single ModeØ5.6 mm, SM Pigtail
L880P010880 nm10 mW30 mA2.0 V12°37°Single ModeØ5.6 mm
L904P010904 nm10 mW50 mA2 V10°30°Single ModeØ5.6 mm
LP915-SF40915 nm40 mW130 mA1.5 V--Single ModeØ9 mm, SM Pigtail
M9-915-0200915 nm200 mW260 mA1.9 V28°Single ModeØ9 mm
M9-915-0300915 nm300 mW370 mA1.9 V28°Single ModeØ9 mm
LP940-SF30940 nm30 mW90 mA1.5 V--Single ModeØ9 mm, SM Pigtail
M9-940-0100940 nm100 mW140 mA1.9 V28°Single ModeØ9 mm
M9-940-0200940 nm200 mW270 mA1.9 V28°Single ModeØ9 mm
DBR976S976 nm45 mW150 mA2.0 V--Single ModeSM, Butterfly
DBR976P976 nm45 mW150 mA2.0 V--Single ModePM, Butterfly
BL976-SAG300976 nm300 mW470 mA2.0 V--Single ModeSM, Butterfly
BL976-PAG500976 nm500 mW830 mA2.0 V--Single ModePM, Butterfly
BL976-PAG700976 nm700 mW1090 mA2.0 V--Single ModePM, Butterfly
BL976-PAG900976 nm900 mW1480 mA2.5 V--Single ModePM, Butterfly
L980P010980 nm10 mW25 mA2 V10°30°Single ModeØ5.6 mm
L980P030980 nm30 mW100 mA1.5 V10°30°Single ModeØ5.6 mm
L9805E2P5980 nm50 mW95 mA1.5 V33°Single ModeØ5.6 mm
L980P100A980 nm100 mW150 mA1.6 V32°MultimodeØ5.6 mm
L980P200980 nm200 mW300 mA1.5 V30°MultimodeØ5.6 mm
L1060P200J1060 nm200 mW280 mA1.3 V32°Single ModeØ9 mm
DBR1064S1064 nm20 mW150 mA2.0 V--Single ModeSM, Butterfly
DBR1064P1064 nm20 mW150 mA2.0 V--Single ModePM, Butterfly
LPS-1060-FC1064 nm50 mW220 mA1.4 V--Single ModeØ9 mm, SM Pigtail
M9-A64-02001064 nm200 mW280 mA1.7 V28°Single ModeØ9 mm
M9-A64-03001064 nm300 mW390 mA1.7 V28°Single ModeØ9 mm
BAL1112CM1208 nm3000 mW5000 mA1.33 V20°26°MultimodeC-Mount
LP1310-SAD21310 nm2.0 mW40 mA1.1 V--Single ModeØ5.6 mm, SM Pigtail
LPS-1310-FC1310 nm2.5 mW20 mA1.1 V--Single ModeØ5.6 mm, SM Pigtail
LPS-PM1310-FC1310 nm2.5 mW20 mA1.1 V--Single ModeØ5.6 mm, PM Pigtail
L1310P5DFB1310 nm5 mW20 mA1.1 VSingle ModeØ5.6 mm
ML725B8F1310 nm5 mW20 mA1.1 V25°30°Single ModeØ5.6 mm
LPSC-1310-FC1310 nm50 mW350 mA2 V--Single ModeØ5.6 mm, SM Pigtail
FPL1053S1310 nm130 mW400 mA1.7 V--Single ModeSM Butterfly
FPL1053P1310 nm130 mW400 mA1.7 V--Single ModePM Butterfly
FPL1053T1310 nm300 mW (Pulsed)750 mA2 V15°28°Single ModeØ5.6 mm
FPL1053C1310 nm300 mW (Pulsed)750 mA2 V15°27°Single ModeChip on Submount
LPS-1550-FC1550 nm1.5 mW30 mA1.0 V--Single ModeØ5.6 mm, SM Pigtail
LPS-PM1550-FC1550 nm1.5 mW30 mA1.1 V--Single ModeØ5.6 mm, SM Pigtail
LP1550-SAD21550 nm2.0 mW40 mA1.0 V--Single ModeØ5.6 mm, SM Pigtail
L1550P5DFB1550 nm5 mW20 mA1.1 V10°Single ModeØ5.6 mm
ML925B45F1550 nm5 mW30 mA1.1 V25°30°Single ModeØ5.6 mm
SFL1550S1550 nm40 mW300 mA1.5 V--Single ModeSM Butterfly
SFL1550P1550 nm40 mW300 mA1.5 V--Single ModePM Butterfly
LPSC-1550-FC1550 nm50 mW250 mA2 V--Single ModeØ5.6 mm, SM Pigtail
FPL1009S1550 nm100 mW400 mA1.4 V--Single ModeSM Butterfly
FPL1009P1550 nm100 mW400 mA1.4 V--Single ModePM Butterfly
FPL1001C1550 nm150 mW400 mA1.4 V18°31°Single ModeChip on Submount
FPL1055T1550 nm300 mW (Pulsed)750 mA2 V15°28°Single ModeØ5.6 mm
FPL1055C1550 nm300 mW (Pulsed)750 mA2 V15°28°Single ModeChip on Submount
SFL1620S1620 nm40 mW300 mA1.5 V--Single ModeSM Butterfly
LPSC-1625-FC1625 nm50 mW350 mA1.5 V--Single ModeØ5.6 mm, SM Pigtail
FPL1054S1625 nm80 mW400 mA1.7 V--Single ModeSM Butterfly
FPL1054P1625 nm80 mW400 mA1.7 V--Single ModePM Butterfly
FPL1054C1625 nm250 mW (Pulsed)750 mA2 V15°28°Single ModeChip on Submount
FPL1054T1625 nm250 mW (Pulsed)750 mA2 V15°28°Single ModeØ5.6 mm
FPL1059S1650 nm80 mW400 mA1.7 V--Single ModeSM Butterfly
FPL1059P1650 nm80 mW400 mA1.7 V--Single ModePM Butterfly
FPL1059C1650 nm225 mW (Pulsed)750 mA2 V15°28°Single ModeChip on Submount
FPL1059T1650 nm225 mW (Pulsed)750 mA2 V15°28°Single ModeØ5.6 mm
FPL1940S1940 nm15 mW400 mA2 V--Single ModeSM Butterfly
FPL2000S2 µm15 mW400 mA2 V--Single ModeSM Butterfly
FPL2000C2 µm30 mW400 mA5.2 V19°Single ModeChip on Submount
FPL2000CM2 µm30 mW400 mA2 V--Single ModeC-Mount
IF3300CM23.30 µm (FP)20 mW480 mA2.5 V35°65°Single ModeTwo-Tab C-Mount
IF3420CM23.42 µm (FP)30 mW510 mA2.6 V30°45°Single ModeTwo-Tab C-Mount
IF3800CM23.80 µm (FP)30 mW550 mA2.5 V40°60°Single ModeTwo-Tab C-Mount
QD4500CM14.00 - 5.00 µm (DFB)40 mW500 mA10.5 V30°40°Single ModeTwo-Tab C-Mount
QF4050CM14.05 µm (FP)150 mW1030 mA12.5 V28°47°Single ModeTwo-Tab C-Mount
QF4400CM14.40 µm (FP)500 mW1020 mA10.7 V26°53°Single ModeTwo-Tab C-Mount
QD4580CM14.54 - 4.62 µm (DFB)40 mW<600 mA10.5 V50°30°Single ModeTwo-Tab C-Mount
QF4550CM14.55 µm (FP)450 mW900 mA10.5 V30°55°Single ModeTwo-Tab C-Mount
QF4800CM14.80 µm (FP)500 mW850 mA15.5 V33°53°Single ModeTwo-Tab C-Mount
QD5500CM15.00 - 8.00 µm (DFB)40 mW<700 mA9.5 V30 °45 °Single ModeTwo-Tab C-Mount
QD5250CM15.20 - 5.30 µm (DFB)120 mW660 mA10.2 V41°52°Single ModeTwo-Tab C-Mount
QF5300CM15.30 µm (FP)150 mW1200 mA9.0 V30°55°Single ModeTwo-Tab C-Mount
QD6500CM16.00 - 7.00 µm (DFB)40 mW<650 mA10 V35 °50 °Single ModeTwo-Tab C-Mount
QF7200CM17.20 µm (FP)250 mW1300 mA8.5 V35°65°Single ModeTwo-Tab C-Mount
QD7500CM17.00 - 8.00 µm (DFB)40 mW<600 mA10 V40°50°Single ModeTwo-Tab C-Mount
QD7500DM17.00 - 8.00 µm (DFB)100 mW<600 mA11.5 V40°55°Single ModeD-Mount
QF7700CM17.70 µm (FP)250 mW1100 mA7.8 V37°65°Single ModeTwo-Tab C-Mount
QD7950CM17.90 - 8.00 µm (DFB)100 mW<1000 mA9.5 V55°70°Single ModeTwo-Tab C-Mount
QD8050CM18.00 - 8.10 µm (DFB)100 mW<1000 mA9.5 V55°70°Single ModeTwo-Tab C-Mount
QD8500CM18.00 - 9.00 µm (DFB)100 mW<900 mA9.5 V40 °55 °Single ModeTwo-Tab C-Mount
QD8500HHLH8.00 - 9.00 µm (DFB)100 mW<600 mA10.2 V--Single ModeHorizontal HHL
QF8350CM18.55 µm (FP)300 mW1750 mA8.5 V55°70°Single ModeTwo-Tab C-Mount
QD8650CM18.60 - 8.70 µm (DFB)50 mW<900 mA9.5 V55°70°Single ModeTwo-Tab C-Mount
QD9500CM19.00 - 10.00 µm (DFB)60 mW800 mA9.5 V40°55°Single ModeTwo-Tab C-Mount
QD9500HHLH9.00 - 10.00 µm (DFB)100 mW<600 mA10.2 V--Single ModeHorizontal HHL
QF9150CM19.15 µm (FP)180 mW1500 mA8.4 V40°65°Single ModeTwo-Tab C-Mount
QF9550CM19.55 µm (FP)80 mW1500 mA7.8 V35°60°Single ModeTwo-Tab C-Mount
QD9550CM19.50 - 9.60 µm (DFB)40 mW1350 mA9.5 V28°60°Single ModeTwo-Tab C-Mount
QD10500CM110.00 - 11.00 µm (DFB)40 mW600 mA10 V40°55°Single ModeTwo-Tab C-Mount

The rows shaded green above denote single-frequency lasers.

4.00 - 5.00 µm Center Wavelength DFB QCLs

Item # Info Center Wavelengtha Tuning Range (Typ.) Powerb Max Operating Currentb Wavelength Tested Spatial Mode
QD4500CM1 info Varies from 4.00 to 5.00 µm
(2500 - 2000 cm-1)
2 cm-1 40 mW (Typ.) 500 mAc Yes Single
QD4580CM1d info Varies from 4.54 to 4.62 µm
(2203 - 2165 cm-1)
4 cm-1 40 mW (Typ.) 600 mA Yes Single
  • These lasers emit at a well defined wavelength that can be tuned over a narrow range. Each device has different optical characteristics. To get the spectrum and output power of a specific, serial-numbered device, click "Choose Item" below, then click on the Docs Icon next to the serial number. If you need a wavelength that is not listed below, please request it by contacting Tech Support.
  • Do not exceed the maximum optical power or maximum drive current, whichever occurs first.
  • Please note that the absolute maximum current is determined on a device-by-device basis. It is listed on the device's data sheet. To view, click "Choose Item" below, then click on the Docs Icon next to the serial number.
  • If broadband emission is preferred, please consider our 4.55 µm Fabry-Perot Lasers.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
Choose ItemQD4500CM1 Support Documentation
QD4500CM1DFB QCL, 4.00 - 5.00 µm CWL, 2 cm-1 Tuning, 40 mW, Two-Tab C-Mount
$6,340.00
Today
Choose ItemQD4580CM1 Support Documentation
QD4580CM1DFB QCL, 4.54 - 4.62 µm CWL, 4 cm-1 Tuning, 40 mW, Two-Tab C-Mount
$6,340.00
Today

5.00 - 6.00 µm Center Wavelength DFB QCLs

Item # Info Center Wavelengtha Tuning Range (Typ.) Powerb Max Operating Currentb Wavelength Tested Spatial Mode
QD5500CM1c info Varies from 5.00 to 6.00 µm
(2000 to 1667 cm-1)
2.5 cm-1 40 mW (Typ.) 700 mAd Yes Single
QD5250CM1c info Varies from 5.20 to 5.30 µm
(1923 - 1887 cm-1)
4 cm-1 120 mW (Typ.) 660 mA Yes Single
  • These lasers emit at a well defined wavelength that can be tuned over a narrow range. Each device has different optical characteristics. To get the spectrum and output power of a specific, serial-numbered device, click "Choose Item" below, then click on the Docs Icon next to the serial number. If you need a wavelength that is not listed below, please request it by contacting Tech Support.
  • Do not exceed the maximum optical power or maximum drive current, whichever occurs first.
  • If broadband emission is preferred, please consider our 5.30 µm Fabry-Perot Lasers.
  • Please note that the absolute maximum current is determined on a device-by-device basis. It is listed on the device's data sheet. To view, click "Choose Item" below, then click on the Docs Icon next to the serial number.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
Choose ItemQD5500CM1 Support Documentation
QD5500CM1DFB QCL, 5.00 - 6.00 µm CWL, 2.5 cm-1 Tuning, 40 mW, Two-Tab C-Mount
$6,340.00
Today
Choose ItemQD5250CM1 Support Documentation
QD5250CM1DFB QCL, 5.20 - 5.30 µm CWL, 4 cm-1 Tuning, 120 mW, Two-Tab C-Mount
$6,340.00
Today

6.00 - 7.00 µm Center Wavelength DFB QCLs

Item # Info Center Wavelengtha Tuning Range (Typ.) Powerb Max Operating Currentb Wavelength Tested Spatial Mode
QD6500CM1 info Varies from 6.00 to 7.00 µm
(1667 - 1429 cm-1)
2 cm-1 40 mW (Typ.) 650 mAc Yes Single
  • These lasers emit at a well defined wavelength that can be tuned over a narrow range. Each device has different optical characteristics. To get the spectrum and output power of a specific, serial-numbered device, click "Choose Item" below, then click on the Docs Icon next to the serial number. If you need a wavelength that is not listed below, please request it by contacting Tech Support.
  • Do not exceed the maximum optical power or maximum drive current, whichever occurs first.
  • Please note that the absolute maximum current is determined on a device-by-device basis. It is listed on the device's data sheet. To view, click "Choose Item" below, then click on the Docs Icon next to the serial number.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
Choose ItemQD6500CM1 Support Documentation
QD6500CM1DFB QCL, 6.00 - 7.00 µm CWL, 2 cm-1 Tuning, 40 mW, Two-Tab C-Mount
$6,340.00
Today

7.00 - 8.00 µm Center Wavelength DFB QCLs

Item # Info Center Wavelengtha Tuning Range (Typ.) Powerb Max Operating Currentb Wavelength Tested Spatial Mode
QD7500CM1c info Varies from 7.00 to 8.00 µm
(1429 - 1250 cm-1)
1.5 cm-1 40 mW (Typ.) 600 mAd Yes Single
QD7950CM1 info Varies from 7.90 to 8.00 µm
(1266 - 1250 cm-1)
3 cm-1 100 mW (Typ.) 1000 mA Yes Single
  • These lasers emit at a well defined wavelength that can be tuned over a narrow range. Each device has different optical characteristics. To get the spectrum and output power of a specific, serial-numbered device, click "Choose Item" below, then click on the Docs Icon next to the serial number. If you need a wavelength that is not listed below, please request it by contacting Tech Support.
  • Do not exceed the maximum optical power or maximum drive current, whichever occurs first.
  • If broadband emission is preferred, please consider our 7.70 µm Fabry-Perot Lasers.
  • Please note that the absolute maximum current is determined on a device-by-device basis. It is listed on the device's data sheet. To view, click "Choose Item" below, then click on the Docs Icon next to the serial number.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
Choose ItemQD7500CM1 Support Documentation
QD7500CM1DFB QCL, 7.00 - 8.00 µm CWL, 1.5 cm-1 Tuning, 40 mW, Two-Tab C-Mount
$6,340.00
Today
Choose ItemQD7950CM1 Support Documentation
QD7950CM1Customer Inspired!DFB QCL, 7.90 - 8.00 µm CWL, 3 cm-1 Tuning, 100 mW, Two-Tab C-Mount
$6,340.00
Today

8.00 - 9.00 µm Center Wavelength DFB QCLs

Item # Info Center Wavelengtha Tuning Range (Typ.) Powerb Max Operating Currentb Wavelength Tested Spatial Mode
QD8050CM1 info Varies from 8.00 to 8.10 µm
(1250 - 1235 cm-1)
2.5 cm-1 100 mW (Typ.) 1000 mA Yes Single
QD8500CM1c info Varies from 8.00 to 9.00 µm
(1250 - 1111 cm-1)
2.5 cm-1 100 mW (Typ.) 900 mAd Yes Single
QD8650CM1 info Varies from 8.60 to 8.70 µm
(1163 - 1149 cm-1)
2.5 cm-1 50 mW (Typ.) 900 mA Yes Single
  • These lasers emit at a well defined wavelength that can be tuned over a narrow range. Each device has different optical characteristics. To get the spectrum and output power of a specific, serial-numbered device, click "Choose Item" below, then click on the Docs Icon next to the serial number. If you need a wavelength that is not listed below, please request it by contacting Tech Support.
  • Do not exceed the maximum optical power or maximum drive current, whichever occurs first.
  • If broadband emission is preferred, please consider our 8.35 µm Fabry-Perot Lasers.
  • Please note that the absolute maximum current is determined on a device-by-device basis. It is listed on the device's data sheet. To view, click "Choose Item" below, then click on the Docs Icon next to the serial number.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
Choose ItemQD8050CM1 Support Documentation
QD8050CM1Customer Inspired!DFB QCL, 8.00 - 8.10 µm CWL, 2.5 cm-1 Tuning, 100 mW, Two-Tab C-Mount
$6,340.00
Lead Time
This item is out of stock and currently has a  lead time
Choose ItemQD8500CM1 Support Documentation
QD8500CM1DFB QCL, 8.00 - 9.00 µm CWL, 2.5 cm-1 Tuning, 100 mW, Two-Tab C-Mount
$6,340.00
Today
Choose ItemQD8650CM1 Support Documentation
QD8650CM1DFB QCL, 8.60 - 8.70 µm CWL, 2.5 cm-1 Tuning, 50 mW, Two-Tab C-Mount
$6,340.00
Today

9.00 - 10.00 µm Center Wavelength DFB QCLs

Item # Info Center Wavelengtha Tuning Range (Typ.) Powerb Max Operating Currentb Wavelength Tested Spatial Mode
QD9500CM1 info Varies from 9.00 to 10.00 µm
(1111 - 1000 cm-1)
2.5 cm-1 60 mW (Typ.) 800 mAc Yes Single
QD9550CM1d info Varies from 9.50 to 9.60 µm
(1053 - 1042 cm-1)
3 cm-1 40 mW (Typ.) 1350 mA Yes Single
  • These lasers emit at a well defined wavelength that can be tuned over a narrow range. Each device has different optical characteristics. To get the spectrum and output power of a specific, serial-numbered device, click "Choose Item" below, then click on the Docs Icon next to the serial number. If you need a wavelength that is not listed below, please request it by contacting Tech Support.
  • Do not exceed the maximum optical power or maximum drive current, whichever occurs first.
  • Please note that the absolute maximum current is determined on a device-by-device basis. It is listed on the device's data sheet. To view, click "Choose Item" below, then click on the Docs Icon next to the serial number.
  • If broadband emission is preferred, please consider our 9.55 µm Fabry-Perot Lasers.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
Choose ItemQD9500CM1 Support Documentation
QD9500CM1DFB QCL, 9.00 - 10.00 µm CWL, 2.5 cm-1 Tuning, 60 mW, Two-Tab C-Mount
$6,340.00
Today
Choose ItemQD9550CM1 Support Documentation
QD9550CM1DFB QCL, 9.50 - 9.60 µm CWL, 3 cm-1 Tuning, 40 mW, Two-Tab C-Mount
$6,340.00
Lead Time
This item is out of stock and currently has a  lead time

10.00 - 11.00 µm Center Wavelength DFB QCLs

Item # Info Center Wavelengtha Tuning Range (Typ.) Powerb Max Operating Currentb Wavelength Tested Spatial Mode
QD10500CM1 info Varies from 10.00 to 11.00 µm
(1000 - 909 cm-1)
2 cm-1 40 mW (Typ.) 600 mAc Yes Single
  • These lasers emit at a well defined wavelength that can be tuned over a narrow range. Each device has different optical characteristics. To get the spectrum and output power of a specific, serial-numbered device, click "Choose Item" below, then click on the Docs Icon next to the serial number. If you need a wavelength that is not listed below, please request it by contacting Tech Support.
  • Do not exceed the maximum optical power or maximum drive current, whichever occurs first.
  • Please note that the absolute maximum current is determined on a device-by-device basis. It is listed on the device's data sheet. To view, click "Choose Item" below, then click on the Docs Icon next to the serial number.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
Choose ItemQD10500CM1 Support Documentation
QD10500CM1DFB QCL, 10.00 - 11.00 µm CWL, 2 cm-1 Tuning, 40 mW, Two-Tab C-Mount
$6,340.00
Today
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Last Edited: Aug 06, 2013 Author: Dan Daranciang