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Reflective optical chopper used in NIST high-power laser measurements.
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.
Key words: attenuator; beamsplitter; calorimeter; device under test; high-power laser; infrared (IR); laser ...
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Source: HighBeam Research, Reflective optical chopper used in NIST high-power laser measurements.