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Variable CO2 laser attenuatorAn 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.
Document ID
19740025898
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
Klein, B. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Degnan, J. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Walker, H. E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Zagwodzki, T. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 3, 2013
Publication Date
August 1, 1974
Subject Category
Masers
Report/Patent Number
NASA-TM-X-70753
X-723-74-243
Report Number: NASA-TM-X-70753
Report Number: X-723-74-243
Accession Number
74N34011
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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