Laser Diode by Thorlabs Inc | Visit website

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The QF3850T1 from Thorlabs is a Fabry-Perot Quantum Cascade Laser Diode that operates from 3.75 to 3.95 µm. This single spatial mode laser provides an optical output power of 200 mW. It has a parallel beam divergence angle (FWHM) of 30 degrees, and a perpendicular beam divergence angle (FWHM) of 40 degrees. This laser diode has a forward voltage of 13.5 V and a threshold current of up to 250 mA. It has a divergent output beam and operates in continuous wave (CW) mode at room temperature. The emitting surface of this semiconductor laser diode is protected by a ZnSe window and the diode is available in a TO-9 package.

Product Specifications View similar products

Product Details

  • Part Number
  • Manufacturer
    Thorlabs Inc
  • Description
    Fabry-Perot Quantum Cascade Laser Diode from 3.75 to 3.95 µm

General Parameters

  • Configuration
  • Technology
    Fabry-Perot (FP), Quantum Cascade
  • Operation Mode
    CW Laser
  • Wavelength
    3.85 µm
  • Output Power
    200 mW
  • Operating Current
    13.5 to 0.6 A
  • Forward Voltage
    13.5 to 15.0 V
  • Reverse Voltage
    1 V
  • Threshold Current
    250 mA
  • Beam Divergence Parallel
    30 Degrees
  • Beam Divergence Perpendicular
    40 Degrees
  • Fiber Modes
    Single Mode
  • Package Type
  • Peak Power
    500 mW
  • Package
    TO-9 Package
  • Type
    Free Space Laser Diode
  • Note
    ZnSe window Emitter Surface

Physical Properties

  • Weight
    0.03 lbs
  • RoHS


  • Operating Temperature
    15 to 50 Degree C
  • Storage Temperature
    -40 to 85 Degree C

Technical Documents

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