4-Channel Fiber-Coupled Laser Source

4 Laser Output Channels with FC/PC Connectors
TEC and Controller for Each Channel
Stable, Low Noise Output
33 Power/Wavelength Options Available

MCLS1-CUSTOM

View of Back Panel

Please Wait

Overview
Specs
Operation
Software
Laser Safety
Feedback

Item #	MCLS1-CUSTOM
Display Power Accuracy	±10%
Current Set Point Resolution	0.01 mA
Temperature Adjust Range	20.00 to 30.00 °C
Temperature Set Point Resolution	±0.01 °C
Noise	<0.5% Typical (Source Dependent)
Rise/Fall Time	<5 µs
Support Documents

Features

4 Laser Output Channels with FC/PC Connectors
Independent Temperature Control Gives High Temperature Stability
Low Noise Output
USB Interface
Low-Profile Package, 2.5" (64 mm) Tall
25 Wavelength Options Available (See Table Below for Details)

Thorlabs' 4-Channel, Fiber-Coupled, Customizable Laser Source provides easy coupling and simple control of laser-diode-driven fiber optics. The laser source is configured to accept the fiber-pigtailed laser diodes shown below. This selection of diodes has discrete wavelengths in the spectral range from 406 - 1550 nm, and can be placed in the source in any combination. The laser source allows more than one channel to be turned on simultaneously; however, it is only possible to adjust the power output of one at a time from the front panel.

Each laser diode is operated from an independent, high-precision, low-noise, constant-current source and temperature control unit. An intuitive LCD interface allows the user to view and set the laser current and temperature independently for each laser. The display indicates the channel number selected, the output wavelength of the source, the operating power calculated from the laser diode monitor diode (if applicable), and the actual temperature to which the laser is set.

This device incorporates a microcontroller to fully control the laser's optical power and temperature as well as to monitor the system for fault conditions. The laser source includes a USB connection that allows remote enabling, power adjustment, and temperature adjustment. On the rear panel, analog inputs are available to modulate the laser diodes' outputs with an externally generated waveform. To prevent damage, the microcontroller will disable the output if the sum of the analog input and internal set point exceeds the laser limits.

Safety
While most output sources fall within the class 3R laser rating, the system was fully designed to meet laser class 3B requirements. There is an interlock located on the rear panel that must be shorted in order for any laser output to be enabled. This can easily be configured to be triggered by doors to disable the lasers in unsafe conditions. The power switch is a keylock system to prevent accidental or unwanted use. Each source has its own enable button allowing the user to choose the light source or sources he wishes to be active, as well as a master enable that must also be set. Each channel includes a green LED indicator to easily determine its current state. There is a 3 second delay before the lasers turn on, and the user is warned by the LED rapidly blinking. The laser must be turned off before connecting or disconnecting a fiber to the output ports, particularly for powers above 10 mW.

In the Box
The MCLS1-CUSTOM includes a universal power supply allowing operation over 100 - 240 VAC without the need for selecting the line voltage. The fuse access is conveniently located on the rear panel. This unit is supplied with a region-specific U.S. or standard European line cord, the pre-configured laser source with all selected lasers installed, and the manual.

Below is a list of available lasers listed by wavelength and showing the corresponding minimum output power and pigtail fiber type. To discuss potential custom wavelengths and configurations not available below, please contact Tech Support. Please use the configurator below to select the pigtails and locations you would like.

Note: An MCLS1-CUSTOM unit must be purchased with at least one pigtail installed, and the channels of the unit must be filled in order. In other words, a laser for Channel 1 must be selected before a laser for Channel 2, Channel 2 before Channel 3, and Channel 3 before Channel 4. If you leave a subsequent channel blank, then the unit will be shipped without a laser in that channel. Subsequent empty channels can be filled by Thorlabs at a later date. Please contact Tech Support prior to sending your unit back to us.

The laser diodes below are not available for purchase separately from the MCLS1-CUSTOM laser source; for users who would like to purchase a fiber-coupled laser diode separately, we offer a wide selection of pigtailed laser diodes in TO-can and butterfly packages.

Diode Name	Typical λ	Wavelength Range	Minimum Power^a	Typical Power	Laser Type	Monitor Photodiode^b	Fiber
MCLS1-406	406 nm	395 - 415 nm	4.0 mW	6.0 mW	Fabry-Perot	Yes	S405-XP
MCLS1-473-20	473 nm	468 - 478 nm	15.0 mW	20 mW	Fabry-Perot	Yes	460HP
MCLS1-488	488 nm	483 - 493 nm	18.0 mW	22 mW	Fabry-Perot	Yes	460HP
MCLS1-520	520 nm	515 - 530 nm	8.0 mW	10.0 mW	Fabry-Perot	No	460HP
MCLS1-635	635 nm	630 - 640 nm	2.5 mW	3.5 mW	Fabry-Perot	Yes	SM600
MCLS1-638	638 nm	628 - 648 nm	10.0 mW	15.0 mW	Fabry-Perot	Yes	SM600
MCLS1-642	642 nm	635 - 645 nm	15.0 mW	20.0 mW	Fabry-Perot	Yes	SM600
MCLS1-658	658 nm	648 - 668 nm	9.5 mW	14.0 mW	Fabry-Perot	Yes	SM600
MCLS1-660	660 nm	653 - 663 nm	15.0 mW	17.0 mW	Fabry-Perot	No	SM600
MCLS1-670	670 nm	660 - 680 nm	1.5 mW	2.5 mW	Fabry-Perot	Yes	SM600
MCLS1-670-4	670 nm	660 - 680 nm	4.0 mW	5.0 mW	Fabry-Perot	Yes	SM600
MCLS1-685	685 nm	675 - 695 nm	10.0 mW	13.5 mW	Fabry-Perot	Yes	SM600
MCLS1-705	705 nm	695 - 715 nm	10.0 mW	15.0 mW	Fabry-Perot	Yes	SM600
MCLS1-730	730 nm	720 - 740 nm	12.5 mW	15.0 mW	Fabry-Perot	Yes	SM600
MCLS1-785	785 nm	770 - 800 nm	6.0 mW	7.5 mW	Fabry-Perot	Yes	780HP
MCLS1-785-25	785 nm	780 - 790 nm	20.0 mW	25.0 mW	Fabry-Perot	No	780HP
MCLS1-808-20	808 nm	803 - 813 nm	20.0 mW	25.0 mW	Fabry-Perot	Yes	SM800-5.6-125
MCLS1-830	830 nm	820 - 840 nm	8.0 mW	10.0 mW	Fabry-Perot	Yes	SM800-5.6-125
MCLS1-850	850 nm	840 - 860 nm	7.5 mW	10.5 mW	Fabry-Perot	Yes	SM800-5.6-125
MCLS1-850-MM	850 nm	847 - 857 nm	45.0 mW	50.0 mW	Fabry-Perot	Yes	GIF625
MCLS1-852	852 nm	847 - 857 nm	20.0 mW	25.0 mW	Fabry-Perot	Yes	SM800-5.6-125
MCLS1-915	915 nm	910 - 920 nm	30.0 mW	40.0 mW	Fabry-Perot	Yes	SM800-5.6-125
MCLS1-940	940 nm	930 - 950 nm	25.0 mW	30.0 mW	Fabry-Perot	Yes	SM800-5.6-125
MCLS1-980	980 nm	965 - 995 nm	6.0 mW	9.0 mW	Fabry-Perot	Yes	980HP
MCLS1-980-20	980 nm	970 - 990 nm	15 mW	20 mW	Fabry-Perot	Yes	SM800-5.6-125
MCLS1-1064	1064 nm	1059 - 1069 nm	20.0 mW	25.0 mW	Fabry-Perot	Yes	HI1060
MCLS1-1310	1310 nm	1290 - 1330 nm	2.5 mW	3.0 mW	Fabry-Perot	Yes	SMF-28e+
MCLS1-1310-15	1310 nm	1290 - 1330 nm	13.0 mW	15.0 mW	Fabry-Perot	No	SMF-28e+
MCLS1-1310DFB	1310 nm	1290 - 1330 nm	1.5 mW	2.0 mW	DFB	Yes	SMF-28e+
MCLS1-1550	1550 nm	1520 - 1580 nm	1.5 mW	2.0 mW	Fabry-Perot	Yes	SMF-28e+
MCLS1-1550-10	1550 nm	1530 - 1570 nm	8.0 mW	10.0 mW	Fabry-Perot	No	SMF-28e+
MCLS1-1550DFB	1550 nm	1540 - 1560 nm	1.5 mW	2.0 mW	DFB	Yes	SMF-28e+
MCLS1-1625	1625 nm	1605 - 1645 nm	10 mW	15 mW	Fabry-Perot	No	SMF-28e+

This is the minimum guaranteed output power of the laser when the adjustment knob is set at the maximum.
Laser diodes with a built-in monitor photodiode can operate at constant power.

Performance Specifications
Display Power Accuracy	±10%
Current Set Point Resolution	0.01 mA
Laser Drive Current per Channel (Max)	120 mA
Temperature Adjust Range	20.00 to 30.00 °C
Temp Set Point Resolution	±0.01 °C
Noise	<0.5% Typical (Source Dependent)
Rise/Fall Time	<5 µs
Modulation Input	0 - 5 V = 0 - Full Power
Modulation Bandwidth	80 kHz Full Depth of Modulation

Laser Warning Lable

General Specifications
AC Input	100 - 240 VAC, 50 - 60 Hz
Input Power	35 VA Max
Fuse Ratings	250 mA
Fuse Type	IEC60127-2/III (250V, Slow Blow Type 'T')
Fuse Size	5 mm x 20 mm
Dimensions (W x H x D)	12.6" x 2.5" x 10.6" (320 mm x 64 mm x 269 mm)
Weight	8.5 lbs (3.9 kg)
Operating Temperature	15 to 35 °C
Storage Temperature	0 to 50 °C
Connections and Controls
Interface Control	Optical Encoder with Pushbutton
Enable and Laser Select	Keypad Switch Enable with LED Indication
Power On	Key Switch
Fiber Ports	FC/PC
Display	LCD, 16x2 Alphanumeric Characters
Input Power Connection	IEC Connector
Modulation Input Connector	BNC (Referenced to Chassis)
Interlock	2.5 mm Mono Phono Jack
Communications
Communications Port	USB 2.0
Com Connection	USB Type B connector
Required Cable	2 m USB Type A to Type B Cable (Replacement Part Number USB-A-79)

For in-depth operation instructions, please view the operating manual. A printed copy of this manual is included with each MCLS1-CUSTOM Laser Source.

Front Panel

Front Panel of MCLS1 Laser Source
Click to Enlarge

Back Panel

Back Panel of MCLS1 Laser Source
Click to Enlarge

Viewing Information

Thorlabs' Multi-Channel Laser Source (MCLS) uses a single four quadrant LCD display to access the information for each output channel (see photo to the right for details). Rotate the control knob to the left of the display to scroll through the channels until the desired channel is selected. The control knob is also a select switch that allows access to the laser current and temperature parameters (see below for more information).

Top Left: Indicates the selected channel.
Top Right: Indicates the wavelength of the selected channel.
Bottom Left: Indicates the power level of the laser diode output. If disabled, the power level will read "0.00 mW." If the selected diode does not include a monitor diode, this will read "No PD."
Bottom Right: Indicates the actual temperature (in °C) that the laser is stabilized to. The default temperature is set to 25.00 °C and is user adjustable. The temperature control is always active and requires 5 to 10 minutes to properly stabilize.

Adjusting the Laser Output Power and Temperature

After selecting a channel, the output power and temperature of the selected laser can be adjusted. The control knob utilizes an intelligent speed control. Turning the knob slowly corresponds to fine adjustment while turning the knob quickly corresponds to coarse adjustment. The laser current adjustment translates to real-time adjustment of output power. The default setting upon first turning on the unit is output power fully off. Note that lasing occurs at the threshold current value, which is different for every source.

Once the desired channel is selected, the Laser Current and Temperature parameters can be adjusted by pressing the control knob in. Pressing in the knob once will select the Laser Current, pressing it a second time will select the Temperature Set Point, and pressing it a third time will revert back to the display mode and lock the selected parameters. The parameter to be adjusted is indicated with blinking text. The resolution is 0.1 mA for the current adjustment and 0.01 °C for the temperature adjustment.

Modulating the Laser Output

The Analog In input can be used to modulate the laser output or to set the laser output remotely using a 5 V power source. The 5 V maximum input corresponds to the maximum calibrated power of each channel. The resulting actual output power is dependent on the set current and operating temperature. In addition, in order to eliminate a dead zone in the power control knob, the output of the unit is offset to the threshold current of the coupled laser diode. Adjusting the knob below threshold will immediately set the current to 0.0 mA (i.e., Standby mode). Therefore, there are two modes of modulation available. Setting the control to "Standby" first allows the analog modulation to utilize the full 0 to 5 V input range. The drawback to this modulation mode is that a minimum voltage is needed to operate above the threshold current. The second mode is to adjust the control knob so that the laser is at or above threshold. The analog modulation voltage will be limited to less than 5 V, but a DC offset will not be required. This DC offset should be kept in mind when using the modulation input since it will limit the actual input voltage range.

Making the Safety Interlock Connections

The MCLS series of laser sources are equipped with a remote interlock connector located on the rear panel. All units have this feature regardless of their FDA and IEC classifications. In order to enable the MCLS source, a short circuit must be applied across the terminals of the Remote Interlock connector. In practice this connection is made available to allow the user to connect a remote-actuated switch to the connector (i.e., an open door indicator). The switch (which must be normally open) has to be closed in order for the unit to be enabled. Once the switch is in an open state, the MCLS source will automatically shut down. If the switch returns to a closed condition, the MCLS source must be re-enabled at the unit by pressing the "Master Enable" switch.

Interlock Mating Connector

Specification	Value
Type of Mating Connector	2.5 mm Mono Phono Jack
Open Circuit Voltage	+5 VDC with Respect to Chassis Ground
Short Circuit Current	~8 mA DC
Connector Polarity	Tip is +5 V, Barrel is Ground
Interlock Switch Requirement^a	Must be Normally Open Dry Contacts

Under no circumstances should any external voltages be applied to the Interlock input

Software

Version 3.0.0

Software package to operate Thorlabs' MCLS1-CUSTOM 4-Channel Laser Source, including a GUI, drivers, and LabVIEW/C++ SDK for secondary development.

Laser Safety and Classification

Safe practices and proper usage of safety equipment should be taken into consideration when operating lasers. The eye is susceptible to injury, even from very low levels of laser light. Thorlabs offers a range of laser safety accessories that can be used to reduce the risk of accidents or injuries. Laser emission in the visible and near infrared spectral ranges has the greatest potential for retinal injury, as the cornea and lens are transparent to those wavelengths, and the lens can focus the laser energy onto the retina.

Safe Practices and Light Safety Accessories

Laser safety eyewear must be worn whenever working with Class 3 or 4 lasers.
Regardless of laser class, Thorlabs recommends the use of laser safety eyewear whenever working with laser beams with non-negligible powers, since metallic tools such as screwdrivers can accidentally redirect a beam.
Laser goggles designed for specific wavelengths should be clearly available near laser setups to protect the wearer from unintentional laser reflections.
Goggles are marked with the wavelength range over which protection is afforded and the minimum optical density within that range.
Laser Safety Curtains and Laser Safety Fabric shield other parts of the lab from high energy lasers.
Blackout Materials can prevent direct or reflected light from leaving the experimental setup area.
Thorlabs' Enclosure Systems can be used to contain optical setups to isolate or minimize laser hazards.
A fiber-pigtailed laser should always be turned off before connecting it to or disconnecting it from another fiber, especially when the laser is at power levels above 10 mW.
All beams should be terminated at the edge of the table, and laboratory doors should be closed whenever a laser is in use.
Do not place laser beams at eye level.
Carry out experiments on an optical table such that all laser beams travel horizontally.
Remove unnecessary reflective items such as reflective jewelry (e.g., rings, watches, etc.) while working near the beam path.
Be aware that lenses and other optical devices may reflect a portion of the incident beam from the front or rear surface.
Operate a laser at the minimum power necessary for any operation.
If possible, reduce the output power of a laser during alignment procedures.
Use beam shutters and filters to reduce the beam power.
Post appropriate warning signs or labels near laser setups or rooms.
Use a laser sign with a lightbox if operating Class 3R or 4 lasers (i.e., lasers requiring the use of a safety interlock).
Do not use Laser Viewing Cards in place of a proper Beam Trap.

Laser Classification

Lasers are categorized into different classes according to their ability to cause eye and other damage. The International Electrotechnical Commission (IEC) is a global organization that prepares and publishes international standards for all electrical, electronic, and related technologies. The IEC document 60825-1 outlines the safety of laser products. A description of each class of laser is given below:

Class	Description	Warning Label
1	This class of laser is safe under all conditions of normal use, including use with optical instruments for intrabeam viewing. Lasers in this class do not emit radiation at levels that may cause injury during normal operation, and therefore the maximum permissible exposure (MPE) cannot be exceeded. Class 1 lasers can also include enclosed, high-power lasers where exposure to the radiation is not possible without opening or shutting down the laser.
1M	Class 1M lasers are safe except when used in conjunction with optical components such as telescopes and microscopes. Lasers belonging to this class emit large-diameter or divergent beams, and the MPE cannot normally be exceeded unless focusing or imaging optics are used to narrow the beam. However, if the beam is refocused, the hazard may be increased and the class may be changed accordingly.
2	Class 2 lasers, which are limited to 1 mW of visible continuous-wave radiation, are safe because the blink reflex will limit the exposure in the eye to 0.25 seconds. This category only applies to visible radiation (400 - 700 nm).
2M	Because of the blink reflex, this class of laser is classified as safe as long as the beam is not viewed through optical instruments. This laser class also applies to larger-diameter or diverging laser beams.
3R	Class 3R lasers produce visible and invisible light that is hazardous under direct and specular-reflection viewing conditions. Eye injuries may occur if you directly view the beam, especially when using optical instruments. Lasers in this class are considered safe as long as they are handled with restricted beam viewing. The MPE can be exceeded with this class of laser; however, this presents a low risk level to injury. Visible, continuous-wave lasers in this class are limited to 5 mW of output power.
3B	Class 3B lasers are hazardous to the eye if exposed directly. Diffuse reflections are usually not harmful, but may be when using higher-power Class 3B lasers. Safe handling of devices in this class includes wearing protective eyewear where direct viewing of the laser beam may occur. Lasers of this class must be equipped with a key switch and a safety interlock; moreover, laser safety signs should be used, such that the laser cannot be used without the safety light turning on. Laser products with power output near the upper range of Class 3B may also cause skin burns.
4	This class of laser may cause damage to the skin, and also to the eye, even from the viewing of diffuse reflections. These hazards may also apply to indirect or non-specular reflections of the beam, even from apparently matte surfaces. Great care must be taken when handling these lasers. They also represent a fire risk, because they may ignite combustible material. Class 4 lasers must be equipped with a key switch and a safety interlock.
All class 2 lasers (and higher) must display, in addition to the corresponding sign above, this triangular warning sign.

Posted Comments:

Christian Haffner (posted 2021-07-02 03:58:34.883)

Could you please comment on the wavelength accuracy of the various laser options for the 1550nm or 16hundred wavlength ratne?

YLohia (posted 2021-07-02 09:38:05.0)

Thank you for contacting Thorlabs. The wavelength range for all the component laser diodes can be found on Page 3 of the manual here: https://www.thorlabs.com/_sd.cfm?fileName=TTN182036-D02.pdf&partNumber=MCLS1-CUSTOM.

Jeannine Knight (posted 2021-01-11 12:33:05.38)

Are the specified power outputs of each diode at the diode itself? If so, what is the coupling efficiency? For example for the 1310 nm, 2.5 mW diode, what power is actually coming out of the box into my fiber?

asundararaj (posted 2021-01-12 10:20:01.0)

Thank you for contacting Thorlabs. The powers specified are the outputs from the MCLS1, which take into account the different losses at the diode-fiber interface.

Atanu Bag (posted 2020-11-11 21:42:30.047)

Fiber patch cables are included with this product or we have to purchase separately? If so please recommend

YLohia (posted 2020-11-12 10:06:59.0)

Fiber patch cables are not included with this product. The exact cable depends on the channel you intend to connect it with. Please refer to the cross reference table below and click on the hyperlinked fiber part number next to the appropriate laser. The fiber page that opens from that link will contain the list of all available stock patch cables that contain that fiber. If you have further questions, please feel free to email us directly at techsupport@thorlabs.com.

user (posted 2020-11-11 21:19:59.343)

Hi, we are interested in generating pulsed light using 4-channel Fiber-Coupled Laser Source with 406 nm Diode (MCLSI-406). We understand by using an external Function Generator we can modulate the output till 80 kHz. Is it possible to achieve 80 kHz modulation using Square wave input? We are curious about any distortion/lag in the output signals while using an external function generator for giving square wave input. I mean can we obtain exact square wave output (@406 nm) till 80 kHz. Kindly let us know limitations and feasibility of the above source for our experiment.

asundararaj (posted 2020-12-04 02:11:39.0)

Thank you for contacting Thorlabs. Square waves can be used with the MCLS1 however, it is still limited by the system bandwidth. This means that rise and fall time will be bandwidth limited and can be estimated by rise time = 0.35/BW. If the square wave is close to the analog bandwidth, the signal will start to distort and look like a sine wave. A square wave is a combination of the fundamental frequency and higher order secondary frequencies to create a short rise and fall edge. These secondary frequencies will be filtered out leaving just the primary frequency. In reality the square wave signal should be 10X less than the limit to produce a square wave output, in this case ~8kHz.

Atanu Bag (posted 2020-11-10 22:15:42.28)

Hi, We are interested in generating pulsed light using 4-channel Fiber-Coupled Laser Source with 406 nm Diode (MCLSI-406). Is it possible to connect external Function Generator to modulate the output light pulse with high frequency (e.g., 1kHz and beyond). Kindly let us know limitations and feasibility of the above source for our experiment.

YLohia (posted 2020-11-11 09:45:16.0)

Hello, these units are specified for 80 kHz full-depth modulation bandwidth when used with a 0 - 5 V signal from a function generator (see Specs tab). Fur further information, please refer to the "Modulating the Laser Output" section on the "Operation" tab.

asundararaj (posted 2020-12-04 01:34:55.0)

Daniel Bivolaru (posted 2020-07-24 09:58:55.24)

Please add detailed product specifications. Thanks.

asundararaj (posted 2020-07-25 12:26:04.0)

Thank you for your feedback. We will look into adding additional details about the individual MCLS1-CUSTOM diodes.

markus.thomas.reichel (posted 2018-09-06 11:14:30.47)

Hi, I used the 1550 nm DFB option to set up a fibre based Mach-Zehnder-interferometer. For symmetric path length it worked well. For asymmetric path length (2 meter difference) the interference signal was fluctuating rapidly. I transformed the signal to the frequence spectrum and observed very high noises from 200Hz to 400Hz. It seems that this is due to wavelength fluctuations of the laser. So do you have some information about the wavelength drift of the 1550nm DFB source?

YLohia (posted 2018-10-29 01:05:16.0)

Hello, thank you for contacting Thorlabs. 1. Could you please confirm your laser source is the LP1550-SAD2 inside our MCLS1 4-channel source? 2. Would it be possible for you to use a fast-sampling spectrometer (>400 Hz) to see if there are any wavelength fluctuations? 3. At what time are you taking measurements? The temperature control on the MCLS1 for example takes 5-10 minutes to properly stabilize. 4. Are you taking measurements at 25°C? Any particularly humid environment? You can try a few different operating temperatures to find a a more stable point. 5. What power and current are you operating this diode at? If operating close to the lasing threshold this may greatly affect stability. 6. Could you send a picture of your setup in case there are any other components that may be influencing the issue? We tried reaching out to you via email to troubleshoot but we never heard back from you.

philip.dumont (posted 2018-04-12 15:35:22.383)

Hi, I am trying to model the performance of a test bed that is using: 4-Channel Fiber-Coupled Laser Source, MCLS1 as a light source. I would like to know if the output is polarized. If it is polarized, is the polarization linear or elliptical. Thanks, Philip Dumont

YLohia (posted 2018-04-16 10:21:51.0)

Hello Philip, thank you for contacting Thorlabs. The output will be polarized, but to a random polarization state which will most likely be elliptical. The MCLS1 contains for separate laser diodes that are linearly polarized and coupled into their individual single mode fibers (non-polarization maintaining). This essentially "scrambles" the polarization and depends on any external stress imposed on the fiber as well as the ambient temperature. Thus, we cannot guarantee a specific polarization state on the output.

ax1c15 (posted 2017-09-07 20:58:55.103)

Dear Sir/Madam, I have a 4-Channel Fibre-Coupled laser source. https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=3800 One of the channels is 808nm. What is the coherent length of the laser (~10cm?)? Also, I have the following laser https://www.thorlabs.com/thorproduct.cfm?partnumber=S1FC1550PM I found out that when I increase the power more than a certain level (~0.32mW) the beam it is not coherent anymore (I am doing interferometric experiments with modulated signals etc.). What is the coherent length of this source? What is happening if I overcome this power level? The coherent length changing with power?

tfrisch (posted 2017-09-26 04:14:31.0)

Hello, thank you for contacting Thorlabs. Coherence length will be related to the linewidth, so for a Fabry-Perot diode at 808nm, I would expect a coherence length on the order of 0.3mm to 3mm. The optical path length for each arm should be matched to within this. As for the change of coherence with power, it is possible that either temperature or back reflections in the system are causing a change in coherence. I will reach out to you to troubleshoot this as coherence is not directly related to power.

user (posted 2017-05-25 12:41:17.697)

Hey, looking for some nice laser source and this looks perfect. What is the coherence length (typical or order) of these LDs (Fabry-Perot)? Thank you! Paul

nbayconich (posted 2017-06-08 05:42:07.0)

Thank you for contacting Thorlabs. The coherence length is determined by the longitudinal mode structure of the fabry perot diodes which is a function of the temperature and current of the fabry perot diode. Since the spectrum is a series of discrete narrow peaks corresponding to the cavity modes it is difficult to determine the coherence length. The typical coherence length for the fabry perot diodes will be only a few cm. I will contact you directly with more information about the coherence length of these fabry perot diodes.

cbrideau (posted 2014-04-04 18:01:53.923)

Hey guys, my argon laser looks like it is about to quit and I am in the market for a replacement. The two lines we use are 488 and 457nm. I see 488 is standard, but do you offer 457, or 454nm as an option? I have seen a 454nm direct diode from other vendors and was wondering if Thor has access to this wavelength.

jvigroux (posted 2014-04-09 08:55:03.0)

A resposne from Julien at Thorlabs: Thank you for your inquiry! The two wavelengths you mention could be efficiently covered using a 490nm and a 455nm. The current filters we use hwoever do not allow for simultaneous operation of those two wavelengths. In order to see if we could use another one, we would need to know all the wavelenths that would be needed in your configuration. I iwll contact you directly.

antony.galea (posted 2013-09-25 09:25:52.387)

Dear Sir/Madam, I am required to complete a laser safety survey by my organization, in which I specify the class of all devices I work with. The MCLS1 is rated as a IIIB device however, it is stated that many of the sources are class IIIR, please specify which sources are considered class IIIR/B. In specific I am presently interested in the 473nm and 488nm sources. Thanks

jlow (posted 2013-09-26 14:10:00.0)

Response from Jeremy at Thorlabs: We will contact you directly to provide the laser class rating for your laser.

sharrell (posted 2013-01-15 17:20:00.0)

Response from Sean at Thorlabs: Thank you for your feedback. We have added a download page for this driver package: http://www.thorlabs.com/software_pages/ViewSoftwarePage.cfm?Code=MCLS1, as well as a new "Software" tab on this page with a link. We will also add this page to our dowload section located under the "Services" menu at the top of the page shortly.

ashaw (posted 2013-01-15 13:33:59.307)

Hello, I can't find the CD containing the driver for my MCLS1. Is there a way to download the driver from the internet? Thanks

tcohen (posted 2012-07-10 14:42:00.0)

Response from Tim at Thorlabs: The minimum power spec references the power that can be guaranteed in an individual unit being run at the operating current. The maximum power out will be the power achieved on the operating current of an individual unit and is best represented by our typical power specification. In this case, it would be 10.5mW.

lumz04 (posted 2012-07-06 02:33:48.0)

hi, for each channel of laser source, I got the parameter of "Minimum Power", for example Channel 1: MCLS1-850, ? = 850 7.5 mW SM800-5.6-125 Fabry-Perot, $385 So what is the Maximum power of this channel? Thanks.

tmorgus (posted 2011-11-23 15:59:00.0)

Any chance of getting a 535nm or similar green line on this system? I know the green laser diodes have just become available, but it would be extremely useful for microscopy to have this line available on this unit. My dream system would be 404/488/535/638nm. These would match the wavelengths commonly used on confocal microscope systems.

user (posted 2011-11-23 15:56:21.0)

Response from Tyler at Thorlabs: I think that this is a great idea and the only potential hurdle I can see is that availability of a green laser diode, which I need to check on. I will contact you to get more information about your application and the power requirements for the green channel. Thank you for providing us with this product idea.

cbrideau (posted 2011-11-22 17:54:13.0)

bdada (posted 2011-10-26 00:22:00.0)

Response from Buki at Thorlabs: Thank you for your feedback. We are working on getting this data and will update our website with additional data soon.

rhs (posted 2011-09-08 11:06:25.0)

I would like to know the spectrum (or at the very least the linewidth) of the two 780 nm modules and of the 1064 nm module.

jjurado (posted 2011-08-01 09:58:00.0)

Response from Javier at Thorlabs to md.hai: Thank you very much for contacting us! The linewidth of the laser diode used in the MCLS1-850 modules is 0.60 nm.

md.hai (posted 2011-07-29 17:27:15.0)

What is the linewidth of the MCLS1-850 laser modules?

Thorlabs (posted 2010-11-30 09:11:53.0)

Response from Javier at Thorlabs to kotov: There are a couple of options to consider. We could perhaps modify the firmware of the MCLS1 to integrate a trigger feature, or you could use a USB DAQ card with four analog outputs. You could provide the modulation signal this way and develop the trigger through your own application. I will contact you directly to discuss your requirements.

kotov (posted 2010-11-23 11:30:46.0)

I would like to use MOD IN inputs and Ive tested manually with TTL pulse and attenuator the usable range of amplitude attenuation. But I would like to use a USB unit with one trigger input and 4 independent amplitude modulated outputs with time width of the input signal (USB controllable). Can you recommend me what device will work for me? USB is prefferable but Ethernet, RS232, RS485 devices can be used as well. What are limitations on the MOD IN signal pulse width?

steffen.michaelis (posted 2010-10-25 17:56:52.0)

For the 4-ch fiber coupled laser source (MCLS1), is it possible to change a laser diode at a later date? Or add another channel if it is initially bought with 2-ch installed?

klee (posted 2009-12-09 14:50:05.0)

A response from Ken at Thorlabs to moweirong: The highest guaranteed output power we can do is 8 mW for 658 nm and 10 mW for 785nm.

moweirong (posted 2009-12-09 14:03:12.0)

Thanks, klee. Then is it possible to get a smaller optical power value around 660 nm and 780nm, like 10-20 mW?

klee (posted 2009-12-09 11:14:01.0)

A response from Ken at Thorlabs to moweirong: The MCLS1 has laser pigtails inside and our typical coupling efficiency is 20%, meaning the output power at the fiber tip is only 20% of the power of the laser diode. Therefore, in order to have 30mW at the fiber output, we will need to use diodes with 150mW. Unfortunately, we do not have the laser diodes with such high power at the wavelengths that you are interested in.

moweirong (posted 2009-12-08 19:15:36.0)

For this 4-ch fiber coupled laser source (MCLS1), is it possible to costomize the laser diodes so that the power at wavelength around 660 nm (or 658 nm) and 780 nm (or 785 nm) to be about 30 mW?

klee (posted 2009-09-15 12:51:29.0)

A response from Ken at Thorlabs to dtmiller: You can have more than one channel turned on simultaneously. However, you can only adjust the power output one at a time. Please refer to Section 4 of the operating manual for details.

dtmiller (posted 2009-09-14 22:08:57.0)

For the 4-channel fiber-coupled laser source (MCLS1), can two or more channels operate simultaneously?

cyryl.abidi (posted 2009-05-21 14:36:38.0)