Abstract
Relay optics designed for use with imaging arrays at the Caltech Submillimeter Observatory are described. An off-axis ellipsoidal mirror with foci displaced from the conjugate planes is used to achieve a Strehl ratio >0.88 over a 2′ square field of view (corresponding to a far field of 15 × 15 diffraction beams) at a wavelength of 350µm. The mirror also provides an aperture-stop image just prior to focus which allows compact entry into cryogenic camera dewars. Using a compensating ellipsoid in subsequent camera optics, the Strehl ratio can be improved to >0.95 at all points across the field, even for off-axis chop angles of the telescope’s secondary mirror as large as 2′.
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Serabyn, E. A wide-field relay optics system for the Caltech Submillimeter Observatory. Int J Infrared Milli Waves 18, 273–284 (1997). https://doi.org/10.1007/BF02677920
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DOI: https://doi.org/10.1007/BF02677920