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Proceedings Paper

Optical design of the SPIRE instrument for FIRST
Author(s): Kjetil Dohlen; Alain Origne; Dominque Pouliquen; Bruce Miles Swinyard
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Paper Abstract

The SPIRE instrument covers the 200 - 670 micron spectral range with a three-band, 4' X 8' diffraction limited field of view photometer, and a dual-band, 2.6' diameter field of view imaging FTS. Optimization of the photometer optics has been given a high priority in the instrument design, allowing an all-reflecting configuration with seven mirrors in one plane. The design corrects for the large tilt of the telescope focal plane due to the off-axis position of the SPIRE field of view, and provides two pupil images (where a beam steering mirror and a cold stop are located) and two field images (where a pick-off mirror for the spectrometer and the final image are located). A large back- focal length allows for dichroic band separators and beam folding mirrors. The spectrometer is a Mach-Zehnder-type, dual channel FTS providing two input and two output ports. The output ports are physically separated from the input ports, and the second input port is fed from a black-body source providing compensation of the telescope background, required to minimize the effect of jitter noise. Powered mirrors are used within the interferometer arms to minimize beam diameters and to leave maximum space for the scan mechanism. The complementary output ports are filtered by band-pass filters to provide the two spectral channels required.

Paper Details

Date Published: 28 July 2000
PDF: 10 pages
Proc. SPIE 4013, UV, Optical, and IR Space Telescopes and Instruments, (28 July 2000); doi: 10.1117/12.393994
Show Author Affiliations
Kjetil Dohlen, Lab. d'Astrophysique de Marseille (France)
Alain Origne, Lab. d'Astrophysique de Marseille (France)
Dominque Pouliquen, Lab. d'Astrophysique de Marseille (France)
Bruce Miles Swinyard, Rutherford Appleton Lab. (United Kingdom)


Published in SPIE Proceedings Vol. 4013:
UV, Optical, and IR Space Telescopes and Instruments
James B. Breckinridge; Peter Jakobsen, Editor(s)

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