Optical designs for submillimeter-wave spherical-primary (sub)orbital telescopes and novel optimization techniques

Details Optical designs for submillimeter-wave spherical-primary (sub)orbital telescopes and novel optimization techniques Optical designs for submillimeter-wave spherical-primary (sub)orbital telescopes and novel optimization techniques

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002spie.4849..245o&link_type=abstract

Highly Innovative Space Telescope Concepts Edited by Howard A. MacEwen. Proceedings of the SPIE, Volume 4849, pp. 245-256 200

Physics

Optics

3

Scientific paper

I discuss the guidelines to the optical design for (sub)millimeter telescopes employing a spherical primary and large-format bolometer arrays. Although various optical solutions for ground visible/IR telescopes using a spherical primary are discussed in the literature, these configurations are usually not acceptable for submillimeter-wave telescopes on orbital or sub-orbital platforms. I thus analyse alternative optical solutions that might be used on spherical-primary antennas, employing either on-axis or (cooled) off-axis optical elements to correct the spherical aberration introduced by the primary, that might be also suitable for ground-based telescopes. These configurations are discussed in relation to optical performance and various operational design constraints, using as a baseline spherical-primary telescope BLAST, the "Balloon-borne Large-Aperture Sub-millimeter Telescope", currently under construction. Modern (sub)millimeter telescopes also require optimized auxiliary optics to efficiently couple the telescope to the receiver over large fields of view. I will thus discuss how to analyze and optimize the design using both the Strehl ratio and the coupling efficiency to evaluate the quality of the off-axis wavefronts and the loss in the power coupling with the horn, using a customized optimization algorithm.

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