NASA NTRS · 19740025898
Variable CO2 laser attenuator
Abstract
An infrared wavelength variable attenuator based on contra-rotating germanium wedges is examined theoretically. The device redirects the paths of internal reflections associated with an optical flat to avoid closely spaced parallel beams at the output. Complementary wedges separated by an air gap compose an optical flat which, when combined with a masking arrangement, restricts unwanted reflections. A model of the device was built and experimentally evaluated. The results compare favorably with the dynamic range of attenuation of 2 to 50 db from theoretical calculations, and show a substantial reduction in the etalon effect associated with pairs of optical flats.
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Klein, B. J., Degnan, J. J., Walker, H. E., Zagwodzki, T.. 1974-08-01. Variable CO2 laser attenuator. https://ntrs.nasa.gov/citations/19740025898
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