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Reflective Optical Chopper Used in NIST High-Power Laser Measurements

Author(s): Li, Xiaoyu | Scott, Thomas | Cromer, Chris | Hadler, Joshua

Journal: Journal of Research of the National Institute of Standards and Technology
ISSN 1044-677X

Volume: 113;
Issue: 6;
Start page: 305;
Date: 2008;
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Keywords: attenuator | beamsplitter | calorimeter | device under test | high-power laser | infrared (IR) | laser detector calibration | laser power meter | monitor detector | reflective optical chopper | wedge-shaped transparent material | visible aiming laser | ZnSe

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.
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