Abstract

A 10-cm chopping secondary for operation in the cryovacuum has been developed. It is momentum compensated and allows square wave modulation of up to 20 Hz and a beam separation of up to several minutes of arc in the sky. The low heat dissipation of 5 mW at a temperature of 4.2 K makes the chopper suitable for a liquid helium-cooled space telescope.

© 1986 Optical Society of America

Large chopping secondary mirror for the 15-m submillimeter James Clerk Maxwell telescope

Herman van de Stadt and Jaap Verkerk
Appl. Opt. 26(16) 3446-3454 (1987)

A Rocket-Borne Liquid Helium-Cooled Infrared Telescope. I: Dewar and Optics

D. P. McNutt, K. Shivanandan, and P. D. Feldman
Appl. Opt. 8(11) 2199-2204 (1969)

Cooled baffle system for spaceborne infrared telescopes

J. J. Bock, A. E. Lange, H. Matsuhara, T. Matsumoto, T. Onaka, and S. Sato
Appl. Opt. 34(13) 2268-2277 (1995)

New far infrared and millimetric telescopes for differential measurements with a large chopping angle in the sky

Marco De Petris, Massimo Gervasi, and Fabrizio Liberati
Appl. Opt. 28(10) 1785-1792 (1989)

Active optics control of VST telescope secondary mirror

Pietro Schipani, Sergio D’Orsi, Davide Fierro, and Laurent Marty
Appl. Opt. 49(16) 3199-3207 (2010)