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Reflective Optical Chopper Used in NIST High-Power Laser Measurements.

Xiaoyu Li1, Thomas Scott1, Chris Cromer1

  • 1National Institute of Standards and Technology, Boulder, CO 80305.

Journal of Research of the National Institute of Standards and Technology
|April 21, 2016
PubMed
Summary
This summary is machine-generated.

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NIST utilizes high-reflectivity optical choppers for calibrating laser detectors. This method offers advantages over traditional wedge beamsplitters for high-power continuous-wave laser applications.

Area of Science:

  • Optical Metrology
  • Laser Systems Engineering
  • Detector Calibration

Background:

  • High-power continuous-wave (CW) lasers require precise detector calibration.
  • Traditional beam splitters, like wedge crystals, have limitations in high-power applications.
  • Optical choppers offer an alternative for beam splitting and attenuation.

Purpose of the Study:

  • To describe the design and operation of high-reflectivity optical choppers.
  • To detail the calibration process for these optical choppers.
  • To compare the performance of choppers against traditional wedge beamsplitters.

Main Methods:

  • Implementation of high-reflectivity optical choppers as beamsplitters and attenuators.
  • Calibration procedures for optical chopper design and operation.
Keywords:
ZnSeattenuatorbeamsplittercalorimeterdevice under testhigh-power laserinfrared (IR)laser detector calibrationlaser power metermonitor detectorreflective optical choppervisible aiming laserwedge-shaped transparent material

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  • Comparative analysis of chopper-based versus wedge beamsplitter techniques.

    • Main Results:

    • Optical choppers have been successfully employed for ten years at NIST.
    • The chopper-based technique demonstrates advantages for calibrating detectors with high-power CW lasers.
    • Detailed design, operation, and calibration of choppers are presented.

    Conclusions:

    • High-reflectivity optical choppers are a viable and advantageous alternative to wedge beamsplitters.
    • The described chopper technique enhances detector calibration accuracy for high-power CW lasers.
    • NIST's decade-long use validates the effectiveness of optical choppers in laser metrology.