Mr. Patrice Houmault Profile

Patrice Houmault

at Houmault.com

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Proceedings Article | 1 July 1990 Paper

Telescope considered as a very high gain antenna

Michel Detaille, Patrice Houmault

Proceedings Volume 1218, (1990) https://doi.org/10.1117/12.18184

KEYWORDS: Telescopes, Mirrors, Free space optical communications, Antennas, Wavefronts, Space telescopes, Sun, Laser applications, Optics manufacturing, Distortion

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A design concept for an optical-antenna telescope to be used in intersatellite communication (in the framework of the ESA SILEX project) is presented. The main technical requirements for a SILEX transmit-receive antennna telescope are reviewed, and a Cassegrain configuration based on a parabolic primary mirror, a hyperbolic secondary mirror, and a five-lense collimator (with baffles to limit stray light) is shown in diagrams and discussed in detail, with particular attention to local angular distortion and transmission-antenna gain. Results from tests on a breadboard version are presented in tables and graphs, including transmission of 92.6 percent at 820 nm, rms wavefront error less than lambda/28, optical gain 114.47 dB, backscattered energy 1.7 x 10 to the -6th at 838 nm, and stray-light intensity slightly above specification at sun aspect angles less than 4.5 deg.

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