The optical design of relay optics for heterodyne millimeter wave focal plane arrays.

Details The optical design of relay optics for heterodyne millimeter wave focal plane arrays. The optical design of relay optics for heterodyne millimeter wave focal plane arrays.

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000ijimw..21..365o&link_type=abstract

International Journal of Infrared and Millimeter Waves, Vol. 21, No. 3, p. 365 - 393

Physics

Optics

Optical Design: Radio Telescopes, Optical Design: Heterodyne Spectrometers

Scientific paper

Since the use of focal plane arrays on millimeter and sub-millimeter telescopes has become more and more important, it has also become evident that there is a need of optimized auxiliary optics that would efficiently couple the telescope to the receiver over large fields of view (i.e., ⪆5-10 beams). In this work the author systematically analyzes several relay optics configurations for heterodyne focal plane arrays, all based on the "Gaussian beam telescope" concept. Because, in examining the image performance of auxiliary optics design at millimeter wavelengths one cannot follow the usual image quality criteria, the author analyzes the designs using both the Strehl ratio and the coupling efficiency to evaluate the quality of the off-axis wavefronts and the loss in power coupling with the horn. Coupling efficiency and Strehl ratio cannot be included in the optimization procedures of commercial optical modelling packages and the author thus describes how to optimize the design using a customized algorithm. The author shows that the minimization of the appropriate error function can reduce the anamorphism of the exit pupil and reduce the loss in the horn coupling.

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