Abstract
The construction of SIS heterodyne imaging arrays for submillimetre wave-lengths requires multiple coupling of the local oscillator signal. The quasi-optical analogue of a multiple cross-guide coupler, employing 45° beam-splitters successively stacked along the local oscillator beam, allows for individual adjustment of local oscillator power to each channel. We analyse the coupling as a function of the focal ratio of the incident beams and the number of beam widths off-axis through which the coupler is extended, and describe a simple construction method to realise a compact and effective design.
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Little, L.T., Davies, S.R. A simple multiple beam lo coupler for SIS heterodyne arrays. Int J Infrared Milli Waves 15, 935–942 (1994). https://doi.org/10.1007/BF02096127
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DOI: https://doi.org/10.1007/BF02096127