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Thulium-Doped Fiber Lasers: 1800 nm to 2050 nm


  • Single Mode, Thulium-Doped, CW Fiber Lasers
  • Fiber-Bragg-Grating-Stabilized ≤0.2 nm RMS Linewidth
  • Stock Wavelengths at 1900 nm, 1950 nm, and 2000 nm
  • Custom Fiber Lasers Available

LFL1950

≥25 mW Fiber Laser,
1950 nm Emission Wavelength

Custom Fiber Lasers with Emission Wavelengths from 1800 nm to 2050 nm Available

Related Items


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Single Channel Benchtop Laser Sources Selection Guide
Spectrum Wavelength TEC Laser Type Cavity Type Output Fiber Type
Visible 405 - 675 nm No Semiconductor Fabry Perot SM, MM, or PM
405 - 685 nm Yes Semiconductor Fabry Perot SM
NIR 785 - 1550 nm No Semiconductor Fabry Perot SM or PM
705 - 2000 nm Yes Semiconductor Fabry Perot SM
1310 - 1550 nm Yes Semiconductor DFB SM
1800 - 2050 nm N/A Fiber Laser Fabry Perot SM
MIR 2.7 µm N/A Fiber Laser Fabry Perot SM
Other Fiber-Coupled Laser Sources
Key Specificationsa
Item # LFL1900 LFL1950 LFL2000
Emission Wavelength 1900 ± 2 nm 1950 ± 2 nm 2000 ± 2 nm
Output Power at Maximum Drive Currentb ≥30 mW ≥25 mW ≥18 mW
RMS Linewidth 200 pm (Max)
Drive Current 450 mA (Max)
Polarization Random
Power Stability
(Ambient Temperature ±2 °C)
<±2% over 24 Hours
(After 15 min Warm-Up)
Relative Intensity Noise
(RMS, 10 Hz - 1 MHz)c

<0.5%
Output Fiber Type SM2000
Output Fiber Mode Field Diameter 13 ± 1 µm @ 1996 nm
Output Fiber NA 0.11
Output Fiber Connector 2.0 mm Narrow Key FC/APC
  • Complete specifications may be found on the Specs tab.
  • The output power is specified at the fiber bulkhead for the emission wavelength.
  • Multiple longitudinal modes exist within the linewidth of the laser that are separated by more than 100 MHz. The beating between these modes can create additional noise at frequencies >100 MHz.

Features

  • CW Lasers in the Thulium Emission Band
    • 1900 nm, 1950 nm, or 2000 nm Emission Wavelengths Available from Stock
    • Custom Versions Available at Discrete Wavelengths from 1800 to 2050 nm
  • Fiber-Bragg-Grating (FBG)-Stabilized ≤0.2 nm RMS Linewidth
  • Adjustable Output Power
  • Intuitive Turnkey Operation Through Panel Interface or Remote USB Commands
  • Single Mode Fiber Output
  • FC/APC Bulkhead

Thorlabs' Thulium-Doped (Tm) Fiber Lasers are benchtop Fabry-Perot fiber laser sources featuring single mode fiber output in the 2 µm band and simple operation for test and measurement applications. Each fiber laser is constructed using a thulium-doped fiber as the gain medium and two fiber Bragg gratings to select the laser wavelength. In contrast to Fabry-Perot semiconductor lasers, the FBG-based Fabry-Perot fiber laser design has narrow-bandwidth FBG reflectors and smaller longitudinal mode spacing (typically <200 MHz compared to >100 GHz for semiconductor lasers). This enables the RMS spectrum to be much narrower (≤0.2 nm versus a few nm) with both short-term and long-term spectral stability. These features make the Tm-doped fiber lasers ideal for applications where spectral stability or narrow spectral width is required.

Three wavelength options are available from stock: 1900 nm, 1950 nm, and 2000 nm. Tm-doped fiber can also support other emission wavelengths from 1800 nm to 2050 nm. Custom fiber lasers with different emission wavelengths are available upon request by contacting Tech Support. The graph below shows the typical output power for a sample of possible custom emission wavelengths.

The laser output is accessible via a fiber connector bulkhead that is compatible with 2.0 mm narrow key FC/APC connectors. An integrated isolator at the output minimizes the impact of back reflections on the laser cavity. For best results, use a fiber patch cable with SM2000 fiber (e.g., Item # P3-2000-FC-2) to connect the output of the laser source to other fiber-coupled devices or free-space optics.

An LCD display allows the user to view the parameters for the fiber laser. The user can adjust the drive current of the pump laser to control the fiber laser output power; each laser is shipped with test data that shows output power scaling as a function of the pump drive current. A USB interface allows control of the laser source through a command line interface. Please see the Software tab for Windows drivers. Each laser source also includes a universal power supply rated for 100 to 240 VAC without the need for selecting the voltage.

For added safety, there is an interlock located on the rear panel that must be shorted in order for the output to be enabled. This can easily be configured to be triggered by lab doors to disable the fiber laser in unsafe conditions. The power switch is a key-lock system to prevent accidental or unwanted use. An enable button must be set to activate the unit with a green LED indicator to easily determine its current state. There is a 3-second delay before the fiber laser turns on, and the user is warned by the rapidly blinking LED.

Custom Fiber Lasers

Thorlabs can produce custom fiber lasers with any emission wavelength from 1800 nm to 2050 nm with a ≤0.2 nm RMS linewidth. Thulium-doped fiber lasers use fiber Bragg gratings for wavelength selection. Please contact Tech Support for details.


Click to Enlarge
This example spectrum shows the narrow linewidth produced by the double FBG design of these Tm-doped fiber lasers. For more details, see the Graphs tab above.
Item # LFL1900 LFL1950 LFL2000
Optical
Emission Wavelength 1900 ± 2 nm 1950 ± 2 nm 2000 ± 2 nm
Output Power at Maximum Drive Currenta ≥30 mW ≥25 mW ≥18 mW
RMS Linewidth 200 pm (Max)
Drive Current 450 mA (Max)
Polarization Random
Power Stability (Ambient Temperature ±2 °C) <±2% Over 24 Hours (After 15 min Warm Up)
Relative Intensity Noise (RMS, 10 Hz - 1 MHz)a <0.5%
Output Fiber Type SM2000
Output Fiber Mode Field Diameter
13 ± 1 µm @ 1996 nm
Output Fiber NA 0.11
Output Fiber Connector 2.0 mm Narrow Key FC/APC
Electrical
AC Input 100 - 240 VAC, 50 - 60 Hz
Input Power 20 VA (Max)
Fuse Ratings 500 mA
Fuse Type IEC60127-2/III (250 VA, Slow Blow Type "T")
Fuse Size 5 mm x 20 mm
Physical
Dimensions (W x H x D) 5.77" x 3.07" x 12.17"
(146.5 mm x 77.9 mm x 309.1 mm)
Weight 1.96 kg (4.32 lbs)
4.13 kg (9.1 lbs) Shipping Weight
Operating Temperature 15 to 35 °C
Storage Temperature 0 to 50 °C
Connections and Controls
Interface Control Optical Encoder with Pushbutton
Enable Select Keypad Switch Enable with LED Indicator
Power On Key Switch
Display LCD, 16 x 2, Alphanumeric Characters
Input Power Connection IEC Connector
Interlock 2.5 mm Mono Phono Jack
Communications
Communications Port USB 2.0 Compatible
COM Connection USB Type B Connector
Required Cable 2 m USB Type A to Type B Cable
(Replacement Item # USB-A-79)
  • The output power is specified at the fiber bulkhead for the emission wavelength.
  • Multiple longitudinal modes exist within the linewidth of the laser that are separated by more than 100 MHz. The beating between these modes can create additional noise at frequencies >100 MHz.

Click to Enlarge
Click Here for Raw Data
Each laser spectrum is measured with a resolution bandwidth of 0.05 nm. Multiple longitudinal modes exist within the linewidth of the laser that are separated by more than 100 MHz. The spectrum of each individual laser source is measured and included in the individualized data sheet that ships with each laser.

Click to Enlarge
Click Here for Raw Data
These L-I curves provide an example of how the output power varies with the pump current, which is adjustable via the knob on the front panel of each source. The L-I curve is also included in the individualized data sheet that ships with each laser.

Remote Interlock Input

2.5 mm Mono Phono Jack

 

2.5 mm Phono Jack

Terminals must be shorted either by included plug or user device, i.e. external switch, for laser mode "ON" to be enabled.

USB

USB Type B

USB Type B

Computer Interface

LFL Drivers

Version 2.12.18

Includes drivers required to control our LFL laser sources in a command-line Windows® environment.

Software Download

Posted Comments:
Deepak Korhalkar  (posted 2019-07-13 07:33:45.3)
Can you offer a Tm laser with 30 to 50 Watt Avg. / CW Power Output. Spectral Line width is not an issue. If yes, what would be the price range ( Qty. 1 initial ) Regards.
YLohia  (posted 2019-07-15 10:39:27.0)
Hello, thank you for contacting Thorlabs. Custom item quotes can be requested by emailing techsupport@thorlabs.com. I have reached out to you directly to discuss your request.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
LFL1900 Support Documentation
LFL1900Tm-Doped Fiber Laser, 1900 nm, ≥30 mW, Single Mode, FC/APC
$5,098.50
Today
LFL1950 Support Documentation
LFL1950Tm-Doped Fiber Laser, 1950 nm, ≥25 mW, Single Mode, FC/APC
$5,098.50
Today
LFL2000 Support Documentation
LFL2000Tm-Doped Fiber Laser, 2000 nm, ≥18 mW, Single Mode, FC/APC
$5,098.50
Today
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