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Single-Frequency, Ultra-Low-Noise Laser, Extended Butterfly Package

  • C-Band, Single-Frequency Laser Source
  • <100 Hz Instantaneous Linewidth with 70 dB Typical SMSR
  • Typical Relative Intensity Noise (RIN) of -165 dBc/Hz
  • Integrated TEC Elements and Thermistors
  • PM Fiber Pigtailed with FC/APC Connector

US Patents: 10193306, 10483718,
10476233, and 10454248


Ultra-Low-Noise Laser, Current Tuning, Extended Butterfly Package, PM Fiber

Frequency noise of an ultra-low-noise laser at various currents within a region of single mode operation. The peak in noise at 43 Hz is due to HVAC systems present in the testing facility. The data is typical, and performance will vary among individual lasers.

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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 and spectral measurements for that serial-numbered device.


  • 1550 nm Typical Center Wavelength
  • Less than -165 dBc/Hz Relative Intensity Noise (RIN)
  • 14-Pin Hermetically Sealed Extended Butterfly Package
  • Two Integrated Thermoelectric Coolers (TEC) and Thermistors
  • PM Fiber Pigtail with 2.0 mm Narrow Key FC/APC Connector
  • Requires User-Supplied Laser Mount and Low-Noise Current Source

Thorlabs' Ultra-Low-Noise (ULN) Hybrid Lasers provide signals with relative intensity noise below -165 dBc/Hz and instantaneous (Lorentzian) linewidths of <100 Hz. The single mode output can reach optical powers of 140 mW with a side mode suppression ratio (SMSR) of 70 dB. These specifications are achieved through a patented design consisting of a single angled facet (SAF) gain chip coupled to a fiber Bragg grating (FBG) enclosed in a hermetically sealed case.1 Two integrated thermoelectric coolers (TECs) and thermistor pairs act in a closed loop to control the temperature of the gain chip and FBG independently. In addition, each laser features an auxiliary thermistor that monitors the case temperature and a built-in monitor photodiode.

The lasing spectrum of these sources changes between single longitudinal mode and multimode depending on the drive current. As the system experiences effects of hysteresis, the width of these ranges will also change depending on whether the drive current is being increased or decreased. Each laser's center wavelength is tested and reported on a serialized data sheet; this wavelength may be anywhere in the ITU C band (1530 - 1565 nm), but most of the devices below will operate at or near 1550 nm. Users should reference the laser's individual data sheet to see where these regions exist for their device. This is discussed further in the Operation tab above.

Specifications for each item can be found in the tables below and by clicking on the blue icons (info icon). These specifications are typical values and the performance will vary from device to device. Each ultra-low-noise laser diode is serialized and shipped with individual test data. Customers can click "Choose Item" below to view a variety of available center wavelengths. The reported specifications are achievable by using a low-noise current supply. Customers that require a specific wavelength may contact tech support to place a special order.

Thorlabs does not offer a current supply with sufficiently low noise to drive this laser at the reported specifications; our testing was performed with a Vecsent Photonics D2-105 Laser Controller. The chosen current supply should be given time to stabilize before the output of the laser is measured. In addition, an optical isolator should be placed at the output of the laser. We recommend the IOT-G-1550A dual-stage isolator, which can achieve a peak isolation of 55 dB; alternatively, two fiber-coupled isolators can be used inline to achieve a similar isolation. 

Current-Tuning vs Temperature-Tuning Configurations
Our ultra-low-noise lasers are available in either a current- or temperature-tuning configuration. The current-tuning configuration is designed to maximize the range of drive currents where the laser operates in a single mode. The temperature-tuning configuration allows for independent adjustment of the FBG temperature without impacting the width of the mode-hope-free range. Users requiring the maximum possible mode-hop-free tuning and/or current range should select the current-tuning configuration, while users wishing to thermally tune the output wavelength without impacting the output power should select the temperature-tuning configuration. See the subgroups below for more information on the differences between these configurations. For more information on how these devices operate, see the Operation tab above.

Mounting and Care
Each laser is housed in an extended 14-pin butterfly-style package. This extended package is not compatible with standard 14-pin laser diode mounts and must be affixed to a purpose-built heat sink. The laser's case has four mounting slots for use with 2-56 (M2) screws. Note that the ultra-low-noise hybrid lasers are extremely sensitive to both seismic and acoustic vibrations, so a mounting fixture that dampens vibration is suggested. Thorlabs offers packs of fifty 2-56 screws (SH2S019) as well as a 2-56 tap (TAP256) to aid in installation. Mounting torque should not exceed 0.14 N•m (20 oz-in); this can be applied and checked using a torque driver.

We recommend cleaning the fiber connector before each use in case any dust or other contaminants have been deposited on the surface. The laser intensity at the center of the fiber tip can be very high and may burn the tip of the fiber if contaminants are present. While the connector is cleaned and capped before shipping, we cannot guarantee that it will remain free of contamination after it is removed from the package. We also recommend that the laser is turned off when connecting or disconnecting the device from other fibers.

1. Morton P, Morton M. "High-Power, Ultra-Low Noise Hybrid Lasers for Microwave Photonics and Optical Sensing." Journal of Lightwave Technology. 2018 November 1; 36: 5048-5057.

Single Longitudinal Mode Operation

Thorlabs' ULN hybrid lasers exhibit fluctuations between single and multimode operation. These regions of stable output change based on a number of factors.1 Here, we will describe how the drive current changes the single mode operating regions. Note: the following data is typical; users should reference the laser's serialized data sheet to see the drive currents that provide stable single mode operation for their particular device.

Longitudinal Mode Transitions
The fluctuations between single mode and multimode operation are due, in part, to the supported lasing modes within the cavity created between the high-reflectance back facet of the gain chip and fiber Bragg grating. The graph below shows the single mode powers for a representative ULN15PT temperature-tuning laser. Drive currents between the single mode ranges will result in multimode outputs. For that reason, the resulting powers were removed from the graph. As an example, when driven at approximately 220 mA, this unit will generate multimode output, while a 300 mA drive current will produce a single mode output. Current-tuning configurations of these lasers are designed to minimize these multimode regions.

Single Mode Operating Regions
Click to Enlarge
Click for Data
Each single mode region is shown, while multimode regions have been removed.

The single mode regions of the ULN hybrid lasers are not a static width; they change depending on whether the current is increased or decreased after single mode operation is reached. The graph below is of a representative ULN15PC current-tuning laser's power output when increasing and decreasing the current. Consider the laser's performance when driven with currents between 700 and 725 mA. If the current is increased from 700 mA, the output will not become single mode until a current of approximately 715 mA (red curves on the graph below); however, after entering this region of single mode operation, the drive current can be lowered to almost 700 mA with the laser cavity maintaining single mode operation (blue curves). When driving a ULN hybrid laser, it is important to keep in mind the direction of the current change to maintain stable operation.

Hysteresis in Single Mode RegionsClick to Enlarge
Click for Data
The range of currents which produce single mode outputs is wider for decreasing currents compared to increasing currents.

Longitudinal Mode Shifts with TFBG
The grating period of the ULN laser's internal FBG changes based on its temperature. When using a temperature-tuning ULN laser, independently setting this temperature helps define the cavity's supported lasing modes and tune to a desired output wavelength. However, because the FBG temperature influences the supported lasing modes, the single mode regions shift. The graph below shows how the single mode operating regions change when adjusting the TFBG in a typical ULN15PT temperature-tuning laser. For a large enough temperature change, the laser will eventually move from single mode to multimode operation. If the laser is driven at a current at the edge of a region of single mode operation, this change can occur over just a few degrees Celsius. For this reason, we recommend monitoring the laser's output with an optical spectrum analyzer while temperature tuning to ensure that the output remains single mode.

ULN Longitudinal Mode Shift with FBG TuningClick to Enlarge
Click for Data
Single mode regions will shift as TFBG changes, which may cause the laser to fall out of single mode operation at a fixed drive current.

Wavelength Shift
In addition affecting the laser's modes, changes in drive current will also shift the output wavelength. A representative graph of a ULN15PC laser's wavelength can be seen below. Each group of colored points indicates a mode-hop-free, single mode operating region. The same wavelength/current dependence can be seen in our temperature-tuning models; however these models are designed to provide wavelength tuning at a constant power by changing the fiber Bragg grating temperature. Note: the stepping structure of the center wavelengths is due to the resolution of the optical spectrum analyzer used to take the measurement; the change in wavelength is smooth across each region of single mode operation.

Change in Center Wavelength in Single Mode RegionsClick to Enlarge
Click for Data
Within single mode operating regions, the center wavelength will shift with current. Each trendline indicates a region of single mode performance. The stepping structure of the measured data is due to the resolution of the optical spectrum analyzer used to take the measurement; the change in wavelength is smooth when in single mode operation.

1. Morton P, Morton M. "High-Power, Ultra-Low Noise Hybrid Lasers for Microwave Photonics and Optical Sensing." Journal of Lightwave Technology. 2018 November 1; 36: 5048-5057.

Extended Butterfly Package Pin Diagram

Extended Butterfly Package Pin Diagram
Pin Identification
Pin Assignment Pin Assignment
1 FBG TEC - 8 Photodiode Anode
2 FBG TEC + 9 Laser Diode Anode
3 Case Thermistor 10 Laser Diode Cathode
4 Case Thermistor 11 Chip Thermistor
5 Photodiode Cathode 12 Chip Thermistor
6 Chip TEC - 13 FBG Thermistor
7 Chip TEC + 14 FBG Thermistor

ECL, DFB, VHG-Stabilized, DBR, and Hybrid 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. In addition, an ECL can be combined with a fiber Bragg grating (FBG) to create a hybrid design. 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 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.

Ultra-Low-Noise Hybrid Laser
Thorlabs Ultra-Low-Noise (ULN) Hybrid Lasers each consist of a single angled facet (SAF) gain chip coupled to an exceptionally long fiber Bragg grating (FBG). They are designed to create a laser cavity, similar to an ECL, through the length of fiber. This cavity provides the ULN hybrid laser with a very narrow line width on the order of 100 Hz and low relative intensity noise of -165 dBc/Hz (typical). The FBG reflects a portion of the light emitted from the gain medium while remaining thermally isolated from it. The grating period can be changed by introducing thermal stress to the fiber, allowing users to temperature tune the laser output while being able to independently stabilize the gain medium's temperature. Because the laser's configuration provides excellent low-noise performance, it is likely the laser will not be the limiting factor at low-noise levels. It is critical to monitor the laser's environment to limit external noise contributions like acoustic and seismic vibrations, as well as driving the laser with a low-noise current source.

Hybrid Laser Diagram
Click to Enlarge

Figure 5: Thorlabs Hybrid Lasers have a Fiber Bragg Grating Coupled to the Active Gain Medium

ECL, DFB, VHG, DBR, and hybrid 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 provides narrow linewidths (<1 MHz). 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 configuration. It can provide mode-hop-free performance over its entire tuning range (<5 nm), 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 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.

Hybrid lasers can be used to achieve extremely low-noise signals. In order to take advantage of this characteristic, the laser must be isolated from unwanted noise sources, such as acoustic and seismic vibrations and drive current noise.

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The rows shaded green below denote single-frequency lasers.

Item #WavelengthOutput
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
L405G2405 nm35 mW50 mA4.9 V10°21°Single ModeØ3.8 mm
DL5146-101S405 nm40 mW70 mA5.2 V19°Single ModeØ5.6 mm
L405P150405 nm150 mW138 mA4.9 VSingle ModeØ3.8 mm
LP405-MF300405 nm300 mW350 mA4.5 V--MultimodeØ5.6 mm, MM Pigtail
L405G1405 nm1000 mW900 mA5.0 V13°45°MultimodeØ9 mm
L450G1447 nm3000 mW2000 mA5.2 V30°MultimodeØ9 mm
LP450-SF15450 nm15 mW85 mA5.5 V--Single ModeØ9 mm, SM Pigtail
PL450B450 nm80 mW75 mA5.2 V4 - 7.5°18 - 25°Single ModeØ3.8 mm
L450P1600MM450 nm1600 mW1200 mA4.8 V19 - 27°MultimodeØ5.6 mm
L473P100473 nm100 mW120 mA5.7 V1024Single ModeØ5.6 mm
LP488-SF20488 nm20 mW70 mA6.0 V--Single ModeØ5.6 mm, SM Pigtail
L488P60488 nm60 mW75 mA6.8 V23°Single ModeØ5.6 mm
LP515-SF3515 nm3 mW50 mA5.3 V--Single ModeØ5.6 mm, SM Pigtail
L515A1515 nm10 mW50 mA5.4 V6.5°21°Single ModeØ5.6 mm
LP520-SF15520 nm15 mW140 mA6.5 V--Single ModeØ9 mm, SM Pigtail
PL520520 nm50 mW250 mA7.0 V22°Single ModeØ3.8 mm
L520P50520 nm45 mW150 mA7.0 V22°Single ModeØ5.6 mm
L520G1520 nm900 mW1600 mA4.8 V7.5°25°MultimodeØ9 mm (non-standard)
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)
LP633-SF50633 nm50 mW170 mA2.6 V--Single ModeØ5.6 mm, SM Pigtail
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-SF50637 nm50 mW140 mA2.6 V--Single ModeØ5.6 mm, SM Pigtail
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
L637G1637 nm1200 mW1100 mA2.5 V10°32°MultimodeØ9 mm (non-standard)
L638P040638 nm40 mW92 mA2.4 V10°21°Single ModeØ5.6 mm
L638P150638 nm150 mW230 mA2.7 V918Single ModeØ3.8 mm
L638P200638 nm200 mW280 mA2.9 V814Single 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
LP660-SF50660 nm50 mW140 mA2.3 V--Single ModeØ5.6 mm, SM Pigtail
HL6545MG660 nm120 mW170 mA2.45 V10°17°Single ModeØ5.6 mm
L660P120660 nm120 mW175 mA2.5 V10°17°Single ModeØ5.6 mm
L670VH1670 nm1 mW2.5 mA2.6 V10°10°Single ModeTO-46
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
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
DBR760PN761 nm9 mW125 mA2.0 V--Single FrequencyButterfly, PM Pigtail
L780P010780 nm10 mW24 mA1.8 V30°Single ModeØ5.6 mm
LP780-SAD15780 nm15 mW180 mA2.2 V--Single FrequencyØ9 mm, SM Pigtail
DBR780PN780 nm45 mW250 mA1.9 V--Single FrequencyButterfly, PM 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 nm25 mW230 mA2.0 V--Single FrequencyButterfly, SM Pigtail
DBR785P785 nm25 mW230 mA2.0 V--Single FrequencyButterfly, PM Pigtail
L785P25785 nm25 mW45 mA1.9 V30°Single ModeØ5.6 mm
FPV785S785 nm50 mW410 mA2.2 V--Single FrequencyButterfly, SM Pigtail
FPV785P785 nm50 mW410 mA2.1 V--Single FrequencyButterfly, PM Pigtail
LP785-SAV50785 nm50 mW500 mA2.2 V--Single FrequencyØ9 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
L785H1785 nm200 mW220 mA2.5 V8.5°16°Single ModeØ5.6 mm
FPL785P785 nm200 mW500 mA2.1 V--Single ModeButterfly, PM Pigtail
FPL785S-250785 nm250 mW (Min)500 mA2.0 V--Single ModeButterfly, SM Pigtail
LD785-SEV300785 nm300 mW500 mA (Max)2.0 V16°Single FrequencyØ9 mm
LD785-SH300785 nm300 mW400 mA2.0 V18°Single ModeØ9 mm
FPL785C785 nm300 mW400 mA2.0 V18°Single Mode3 mm x 5 mm Submount
LD785-SE400785 nm400 mW550 mA2.0 V16°Single ModeØ9 mm
L795VH1795 nm0.25 mW1.2 mA1.8 V20°12°Single FrequencyTO-46
DBR795PN795 nm40 mW230 mA2.0 V--Single FrequencyButterfly, PM Pigtail
ML620G40805 nm500 mW650 mA1.9 V34°MultimodeØ5.6 mm
L808P010808 nm10 mW50 mA2 V10°30°Single ModeØ5.6 mm
L808P030808 nm30 mW65 mA2 V10°30°Single ModeØ5.6 mm
DBR808PN808 nm42 mW250 mA2 V--Single FrequencyButterfly, PM Pigtail
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 FrequencyØ9 mm
FPL808S808 nm200 mW750 mA2.3 V--Single ModeButterfly, SM Pigtail
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
DBR816PN816 nm45 mW250 mA1.95 V--Single FrequencyButterfly, PM Pigtail
LP820-SF80820 nm80 mW230 mA2.3 V--Single ModeØ5.6 mm, SM Pigtail
L820P100820 nm100 mW145 mA2.1 V17°Single ModeØ5.6 mm
L820P200820 nm200 mW250 mA2.4 V17°Single ModeØ5.6 mm
DBR828PN828 nm24 mW250 mA2.0 V--Single FrequencyButterfly, PM Pigtail
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
FPL830S830 nm350 mW900 mA2.5 V--Single ModeButterfly, SM Pigtail
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
L840P200840 nm200 mW255 mA2.4 V917Single ModeØ5.6 mm
L850VH1850 nm2 mW4 mA2.2 V12°12°Single FrequencyTO-46
L850P010850 nm10 mW50 mA2 V10°30°Single ModeØ5.6 mm
L850P030850 nm30 mW65 mA2 V8.5°30°Single ModeØ5.6 mm
LP850-SF80850 nm80 mW230 mA2.3 V--Single ModeØ5.6 mm, SM Pigtail
FPV852S852 nm20 mW400 mA2.2 V--Single FrequencyButterfly, SM Pigtail
FPV852P852 nm20 mW400 mA2.2 V--Single FrequencyButterfly, PM Pigtail
DBR852PN852 nm24 mW300 mA2.0 V--Single FrequencyButterfly, PM Pigtail
LP852-SF30852 nm30 mW115 mA1.9 V--Single ModeØ9 mm, SM Pigtail
L852P50852 nm50 mW75 mA1.9 V22°Single ModeØ5.6 mm
L852P100852 nm100 mW120 mA1.9 V28°Single ModeØ9 mm
L852P150852 nm150 mW170 mA1.9 V18°Single ModeØ9 mm
FPL852S852 nm350 mW900 mA2.5 V--Single ModeButterfly, SM Pigtail
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 FrequencyØ9 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
L895VH1895 nm0.2 mW1.4 mA1.6 V20°13°Single FrequencyTO-46
DBR895PN895 nm12 mW300 mA2 V--Single FrequencyButterfly, PM Pigtail
L904P010904 nm10 mW50 mA2 V10°30°Single ModeØ5.6 mm
LP915-SF40915 nm40 mW130 mA1.5 V--Single ModeØ9 mm, SM Pigtail
M9-915-0300915 nm300 mW370 mA1.9 V28°Single ModeØ9 mm
LP940-SF30940 nm30 mW90 mA1.5 V--Single ModeØ9 mm, SM Pigtail
M9-940-0200940 nm200 mW270 mA1.9 V28°Single ModeØ9 mm
FPV976S976 nm30 mW400 mA (Max)2.2 V--Single FrequencyButterfly, SM Pigtail
FPV976P976 nm30 mW400 mA (Max)2.2 V--Single FrequencyButterfly, PM Pigtail
DBR976PN976 nm33 mW450 mA2.0 V--Single FrequencyButterfly, PM Pigtail
BL976-SAG300976 nm300 mW470 mA2.0 V--Single ModeButterfly, SM Pigtail
BL976-PAG500976 nm500 mW830 mA2.0 V--Single ModeButterfly, PM Pigtail
BL976-PAG700976 nm700 mW1090 mA2.0 V--Single ModeButterfly, PM Pigtail
BL976-PAG900976 nm900 mW1480 mA2.5 V--Single ModeButterfly, PM Pigtail
L980P010980 nm10 mW25 mA2 V10°30°Single ModeØ5.6 mm
LP980-SF15980 nm15 mW70 mA1.5 V--Single ModeØ5.6 mm, SM Pigtail
L980P030980 nm30 mW50 mA1.5 V10°35°Single ModeØ5.6 mm
L9805E2P5980 nm50 mW95 mA1.5 V33°Single ModeØ5.6 mm
L980P100A980 nm100 mW150 mA1.6 V32°MultimodeØ5.6 mm
L980H1980 nm200 mW300 mA (Max)2.0 V13°Single ModeØ9 mm
L980P200980 nm200 mW300 mA1.5 V30°MultimodeØ5.6 mm
DBR1060SN1060 nm130 mW650 mA2.0 V--Single FrequencyButterfly, SM Pigtail
DBR1060PN1060 nm130 mW650 mA1.8 V--Single FrequencyButterfly, PM Pigtail
L1060P200J1060 nm200 mW280 mA1.3 V32°Single ModeØ9 mm
DBR1064S1064 nm40 mW150 mA2.0 V--Single FrequencyButterfly, SM Pigtail
DBR1064P1064 nm40 mW150 mA2.0 V--Single FrequencyButterfly, PM Pigtail
DBR1064PN1064 nm110 mW550 mA2.0 V--Single FrequencyButterfly, PM Pigtail
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
DBR1083PN1083 nm100 mW500 mA1.75 V--Single FrequencyButterfly, PM Pigtail
LP1310-SAD21310 nm2.0 mW40 mA1.1 V--Single FrequencyØ5.6 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 FrequencyØ5.6 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 ModeButterfly, SM Pigtail
FPL1053P1310 nm130 mW400 mA1.7 V--Single ModeButterfly, PM Pigtail
FPL1053T1310 nm300 mW (Pulsed)750 mA2 V15°28°Single ModeØ5.6 mm
FPL1053C1310 nm300 mW (Pulsed)750 mA2 V15°27°Single ModeChip on Submount
L1310G11310 nm2000 mW5 A1.5 V24°MultimodeØ9 mm
L1370G11370 nm2000 mW5 A1.4 V22°MultimodeØ9 mm
BL1425-PAG5001425 nm500 mW1600 mA2.0 V--Single ModeButterfly, PM Pigtail
BL1436-PAG5001436 nm500 mW1600 mA2.0 V--Single ModeButterfly, PM Pigtail
L1450G11450 nm2000 mW5 A1.4 V22°MultimodeØ9 mm
BL1456-PAG5001456 nm500 mW1600 mA2.0 V--Single ModeButterfly, PM Pigtail
L1480G11480 nm2000 mW5 A1.6 V20°MultimodeØ9 mm
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 FrequencyØ5.6 mm, SM Pigtail
LP1550-PAD21550 nm2.0 mW40 mA1.0 V--Single FrequencyØ5.6 mm, PM Pigtail
L1550P5DFB1550 nm5 mW20 mA1.1 V10°Single FrequencyØ5.6 mm
ML925B45F1550 nm5 mW30 mA1.1 V25°30°Single ModeØ5.6 mm
SFL1550S1550 nm40 mW300 mA1.5 V--Single FrequencyButterfly, SM Pigtail
SFL1550P1550 nm40 mW300 mA1.5 V--Single FrequencyButterfly, PM Pigtail
LPSC-1550-FC1550 nm50 mW250 mA2 V--Single ModeØ5.6 mm, SM Pigtail
FPL1009S1550 nm100 mW400 mA1.4 V--Single ModeButterfly, SM Pigtail
FPL1009P1550 nm100 mW400 mA1.4 V--Single ModeButterfly, PM Pigtail
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
L1550G11550 nm1700 mW5 A1.5 V28°MultimodeØ9 mm
L1575G11575 nm1700 mW5 A1.5 V28°MultimodeØ9 mm
LPSC-1625-FC1625 nm50 mW350 mA1.5 V--Single ModeØ5.6 mm, SM Pigtail
FPL1054S1625 nm80 mW400 mA1.7 V--Single ModeButterfly, SM Pigtail
FPL1054P1625 nm80 mW400 mA1.7 V--Single ModeButterfly, PM Pigtail
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 ModeButterfly, SM Pigtail
FPL1059P1650 nm80 mW400 mA1.7 V--Single ModeButterfly, PM Pigtail
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 ModeButterfly, SM Pigtail
FPL2000S2 µm15 mW400 mA2 V--Single ModeButterfly, SM Pigtail
FPL2000C2 µm30 mW400 mA5.2 V19°Single ModeChip on Submount
ID3250HHLH3.00 - 3.50 µm (DFB)5 mW400 mA5 V6 mrad (0.34°)6 mrad (0.34°)Single FrequencyTwo-Tab C-Mount
QD4500CM14.00 - 5.00 µm (DFB)40 mW<500 mA10.5 V30°40°Single FrequencyTwo-Tab C-Mount
QF4050C24.05 µm (FP)300 mW400 mA12 V3042Single ModeTwo-Tab C-Mount
QF4050T14.05 µm (FP)300 mW600 mA (Max)12.0 V30°40°Single ModeØ9 mm
QF4050D24.05 µm (FP)800 mW750 mA13 V30°40°Single ModeD-Mount
QF4050D34.05 µm (FP)1200 mW1000 mA13 V30°40°Single ModeD-Mount
QF4550CM14.55 µm (FP)450 mW900 mA10.5 V30°55°Single ModeTwo-Tab C-Mount
QF4600T24.60 µm (FP)200 mW500 mA (Max)13.0 V30°40°Single ModeØ9 mm
QF4600T14.60 µm (FP)400 mW800 mA (Max)12.0 V30°40°Single ModeØ9 mm
QF4600D44.60 µm (FP)2500 mW1800 mA12.5 V40°30°Single ModeD-Mount
QD5500CM15.00 - 8.00 µm (DFB)40 mW<700 mA9.5 V30 °45 °Single FrequencyTwo-Tab C-Mount
QD5250CM15.20 - 5.30 µm (DFB)120 mW<660 mA10.2 V41°52°Single FrequencyTwo-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 FrequencyTwo-Tab C-Mount
QD7500CM17.00 - 8.00 µm (DFB)40 mW<600 mA10 V40°50°Single FrequencyTwo-Tab C-Mount
QD7500HHLH7.00 - 8.00 µm (DFB)50 mW700 mA12 V6 mrad (0.34°)6 mrad (0.34°)Single FrequencyHorizontal HHL
QD7500DM17.00 - 8.00 µm (DFB)100 mW<600 mA11.5 V40°55°Single FrequencyD-Mount
QD7950CM17.90 - 8.00 µm (DFB)100 mW<1000 mA9.5 V55°70°Single FrequencyTwo-Tab C-Mount
QD8050CM18.00 - 8.10 µm (DFB)100 mW<1000 mA9.5 V55°70°Single FrequencyTwo-Tab C-Mount
QD8500CM18.00 - 9.00 µm (DFB)100 mW<900 mA9.5 V40 °55 °Single FrequencyTwo-Tab C-Mount
QD8500HHLH8.00 - 9.00 µm (DFB)100 mW<600 mA10.2 V6 mrad (0.34°)6 mrad (0.34°)Single FrequencyHorizontal 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 FrequencyTwo-Tab C-Mount
QD9500CM19.00 - 10.00 µm (DFB)60 mW<800 mA9.5 V40°55°Single FrequencyTwo-Tab C-Mount
QD9500HHLH9.00 - 10.00 µm (DFB)100 mW<600 mA10.2 V6 mrad (0.34°)6 mrad (0.34°)Single FrequencyHorizontal HHL
QF9150C29.15 µm (FP)200 mW850 mA11 V40°60°Single ModeTwo-Tab C-Mount
QF9550CM19.55 µm (FP)80 mW1500 mA7.8 V35°60°Single ModeTwo-Tab C-Mount
QD10500CM110.00 - 11.00 µm (DFB)40 mW<600 mA10 V40°55°Single FrequencyTwo-Tab C-Mount
QD10500HHLH10.00 - 11.00 µm (DFB)50 mW700 mA12 V6 mrad (0.34°)6 mrad (0.34°)Single FrequencyHorizontal HHL

The rows shaded green above denote single-frequency lasers.

Current-Tuning, C-Band Ultra-Low-Noise Hybrid Laser

ULN Temperature Tuning Configuration Single Mode PowerClick to Enlarge
Click for Data
This graph shows typical single mode operating regions for a current-tuning ULN laser. Multimode regions have been removed. See each device's individualized datasheet for specific performance.
  • 20 pm Typical Mode-Hope-Free Tuning Range
  • -165 dBc/Hz Typical Relative Intensity Noise (RIN)
  • 0.25 pm/mA Current-Tuning Coefficient

Thorlabs' current-tuning ULN laser provides a wide range of currents where the laser operates in a single mode when compared to the temperature-tuning configuration. This maximizes the mode-hop-free current tuning range, as shown in the graph to the right. In this configuration, it is not possible to independently adjust the temperature setpoints of the ULN gain chip and fiber Bragg grating (FBG) without reducing the mode-hop-free range. Each device includes an individualized datasheet, which provides the optimal temperature difference, ΔT, between the FBG and gain chip.

See the blue info icon (info icon) in the table below for typical performance specifications.

This laser uses Corning® PM15-U25D polarization maintaining fiber, which is terminated with an FC/APC, 2.0 mm narrow key connector. The fiber's slow axis is aligned parallel to the connector key.

Item # Info Center Wavelength
Current (Typical)
Linewidtha Fiber
Pin Code Monitor
Spatial Mode
ULN15PC info 1550 nm 140 mW 650 mA <100 Hz PM 14-Pin, Non-Standard Yes Yes Singleb
  • At High-Current End of Single Mode Range
  • Single Mode in Both Spatial and Longitudinal Modes
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
Choose ItemULN15PC Support Documentation
ULN15PC1550 nm, 140 mW, Ultra-Low-Noise Laser, Current Tuning, Extended Butterfly Package, PM Fiber, FC/APC

Temperature-Tuning, C-Band Ultra-Low-Noise Hybrid Laser

ULN Temperature Tuning Configuration Single Mode PowerClick to Enlarge
Click for Data
This graph shows typical single mode operating regions for a temperature-tuning ULN laser. Multimode regions have been removed. See each device's individualized datasheet for specific performance.
  • 500 pm Typical Temperature-Tuning Range
  • -165 dBc/Hz Typical Relative Intensity Noise (RIN)
  • 9 pm/K Temperature-Tuning Coefficient

Thorlabs' temperature-tuning ULN laser allows for independent adjustment of the fiber Bragg grating (FBG) temperature, providing a wide 500 pm typical tuning range without impacting the laser output power. See the blue info icon (info icon) in the table below for typical performance specifications. Device-specific test data can be found in the individualized datasheets.

Note that because the single mode regions do move as the FBG temperature is adjusted, a ULN kept at a single current my not operate single mode at all temperatures; see the Operation tab for more details.

This laser uses Corning® PM15-U25D polarization maintaining fiber, which is terminated with an FC/APC, 2.0 mm narrow key connector. The fiber's slow axis is aligned parallel to the connector key.

Item # Info Center Wavelength
Current (Typical)
Linewidtha Fiber
Pin Code Monitor
Spatial Mode
ULN15PT info 1550 nm 140 mW 650 mA <100 Hz PM 14-Pin, Non-Standard Yes Yes Singleb
  • At High-Current End of Single Mode Range
  • Single Mode in Both Spatial and Longitudinal Modes
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Choose ItemULN15PT Support Documentation
ULN15PT1550 nm, 140 mW, Ultra-Low-Noise Laser, Temperature Tuning, Extended Butterfly Package, PM Fiber, FC/APC
Lead Time
This item is out of stock and currently has a  lead time
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