%0 Journal Article
%T Reflective Optical Chopper Used in NIST High-Power Laser Measurements
%A Li
%A Xiaoyu
%A Scott
%A Thomas
%A Cromer
%A Chris
%A Hadler
%A Joshua
%J Journal of Research of the National Institute of Standards and Technology
%D 2008
%I The National Institute of Standards and Technology
%X For the past ten years, NIST has used high-reflectivity, optical choppers as beamsplitters and attenuators when calibrating the absolute responsivity and response linearity of detectors used with high-power CW lasers. The chopper-based technique has several advantages over the use of wedge-shaped transparent materials (usually crystals) often used as beam splitters in this type of measurement system. We describe the design, operation and calibration of these choppers. A comparison between choppers and transparent wedge beampslitters is also discussed.
%K attenuator
%K beamsplitter
%K calorimeter
%K device under test
%K high-power laser
%K infrared (IR)
%K laser detector calibration
%K laser power meter
%K monitor detector
%K reflective optical chopper
%K wedge-shaped transparent material
%K visible aiming laser
%K ZnSe
%U http://nvl.nist.gov/pub/nistpubs/jres/113/6/V113.N06.A01.pdf