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- W69811802 abstract "Heterodyne array receiver systems for both ground based and satellite telescopefacilities are now becoming feasible for imaging in the submillimetre/terahertzregions of the EM spectrum. Phase gratings can be usefully employed as highefficiency passive multiplexing devices in the local oscillator (LO) injection chain ofsuch receivers, ensuring that each element of the array is adequately biased and thatthe reflected LO power level at the array is minimised. For the wavelengths of interestboth transmission and reflection gratings can be manufactured by milling anappropriate pattern of slots into the surface(s) of a suitable material. Thus, therequired phase modulation is produced by the resulting pattern of varying optical pathlengths suffered by the incident wave-front. We report on work we are undertaking todevelop all reflection quasi-optical multiplexing systems so as to reduce reflectionlosses at the grating and minimise the number of surfaces that can contribute tostanding wave effects in the optical system. As part of this endeavour we have alsodeveloped a quasi-optical technique for analysing the inevitable degradation due tomultiple reflections on transmission grating design. This analysis is based on theGaussian beam mode technique, and a further application of this technique allows oneto assess tolerance limitations on the grating." @default.
- W69811802 created "2016-06-24" @default.
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- W69811802 date "2000-05-01" @default.
- W69811802 modified "2023-09-24" @default.
- W69811802 title "Quasi-optical multiplexing using reflection phase gratings" @default.
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