Optical considerations in infrared heterodyne spectrometer design

Details Optical considerations in infrared heterodyne spectrometer design Optical considerations in infrared heterodyne spectrometer design

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980hst..rept..365k&link_type=abstract

In NASA. Langley Res. Center Heterodyne Systems and Technol., Pt. 2 p 365-372 (SEE N80-29672 20-36)

Mathematics

Carbon Dioxide Lasers, Infrared Spectrometers, Optical Heterodyning, Tunable Lasers, Beam Splitters, Laser Outputs, Oscillators, Spectral Sensitivity

Scientific paper

The optical design considerations for optimization of sensitivity, tunability, and versatility of an infrared heterodyne spectrometer are discussed using the GSFC CO2 laser heterodyne spectrometer optical front end as an example. Problems related to the coherent nature of the laser local oscillator beam (e.g., interference effects at edges of optical elements and at the beam combining beamsplitter) are described and proper beamsplitter design discussed. Optimum matching to the telescope is discussed. The severe effects of large central obscuration on the coherent telescope efficiency are described and steps to partially recover the lost system sensitivity are proposed. Measurements made with the GSFC 48 inch telescope (linear obscuration rate = 0.5) and the KPNO McMathe telescope (no obscuration) are given as examples.

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