Optical design of a dual-polarization receiver for 220-280 GHz

Details Optical design of a dual-polarization receiver for 220-280 GHz Optical design of a dual-polarization receiver for 220-280 GHz

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ijimw..10.1233p&link_type=abstract

International Journal of Infrared and Millimeter Waves (ISSN 0195-9271), vol. 10, Oct. 1989, p. 1233-1261.

Physics

Optics

8

Microwave Equipment, Network Synthesis, Optical Properties, Telescopes, Dielectrics, Interferometers, Optical Filters, Optical Heterodyning, Polarization Characteristics, Schottky Diodes

Scientific paper

A 220-280 GHz dual polarization receiver has been built for the James Clerk Maxwell Telescope. Schottky diode mixers cooled to about 15 K by a closed-cycle refrigerator are used to give DSB noise temperatures of 300 K and 420 K in the two channels. The optical design is based on Gaussian-beam optics, and is frequency independent; it allows the significant higher-order Gaussian modes to propagate unhindered, thus offering the prospect of very high aperture efficiency. The receiver includes a number of novel optical components, including a completely symmetric dual polarization Martin-Puplett interferometer. Measurements of the performance of the optical system are presented.

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