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FPI 100

Fabry-Perot Interferometer

  • Convenient mode analysis of diode lasers
  • Various mirror sets and detectors for 330 .. 3000 nm
  • Free spectral range 1 GHz or 4 GHz
  • Finesse > 200, typ. > 400

The FPI 100 is a confocal, scanning Fabry-Perot interferometer with a built-in photodetector unit, designed for measuring and controlling the mode profiles of continuous wave (cw) lasers. The FPI is available with different mirror sets and photodetectors for wavelength ranges between 330 nm and 3000 nm. The standard mirror reflectivity is 99.8 %, corresponding to a typical finesse of > 400, resolving even narrow laser lines.

  • Specifications
    Article #Wavelength rangeFSR*Finesse spec.Finesse typ.Resolution typAperture
    FPI 100-0355-y330 – 380 nm

    y = 1 → 1 GHz

    y = 4 → 4 GHz

    > 200400

    y = 1 → 2.5 MHz

    y = 4 → 10 MHz

    7 mm
    FPI-100-0400-y 380 – 430 nm> 200400
    FPI-100-0500-y430 – 660 nm> 300400
    FPI-100-0980-y825 – 1200 nm> 400500

    y = 1 → 2 MHz

    y = 4 → 8 MHz

    FPI-100-1500-y1200 – 1700 nm> 300500
    FPI-100-0750-1615 – 885 nm1 GHz> 4005002 MHz
    FPI-100-2000-1**1700 – 2550 nm> 2004002.5 MHz
    FPI-100-2800-1**2650 – 3000 n> 200400


    * Tolerance of FSR ± 1 %
    ** Requires miniScan 100 and PDA-S (not miniScan 102)

  • Additional Information
    • Base unit includes piezo stack for scanning, mirrors, and photodetector.
    • Not included: HV scan generator or fiber adapter – please see Options + Related Products.
    • Mirror sets of all FPI articles are also available as mirror exchange kits.
  • Options
    • Fiber connector with FC/APC adapter
    • Mirror exchange kits: Please refer to Technical Information page for available wavelengths and specifications
    • Photo diode exchange kits (visible / NIR / IR range)
    • User-specific finesse values: please inquire
    • SC 110: Scan unit, part of DC 110 laser electronics
    • miniScan: Stand-alone scan generator with photo diode amplifier
  • Related Products
  • Literature