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Proceedings Paper

Grisms from germanium/silicon for astronomical instruments
Author(s): Hans-Ulrich Kaeufl; Karl Kuehl; Steffan Vogel
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Paper Abstract

An overview on the use of grisms from high refractive index optical materials is given. When using grisms manufactured from silicon or germanium two IR focal-reducers of the European Southern Observatory (ESO) can serve as medium resolution echelle spectrometers. A silicon echelle grism allowing for a spectral resolution of 5000 for a 1 arcsec slit is being developed for SOFI, a near IR instrument featuring a 1024 Rockwell HgCdTe detector at ESO's 3.5m New Technology Telescope. For TIMMI2, ESO's new 10/20 micrometers instrument for the 3.6m telescope a germanium echelle grism is being built. For TIMMI a 10 micrometers camera featuring a 64 X 64 detector a low resolution germanium grism yielding a spectral resolution (lambda) /(Delta) (lambda) equals 200 for a 1 arcsec slit has already been successfully commissioned. The manufacturing process, the status and performances will be presented. Moreover we show some astronomical results.

Paper Details

Date Published: 21 August 1998
PDF: 8 pages
Proc. SPIE 3354, Infrared Astronomical Instrumentation, (21 August 1998); doi: 10.1117/12.317257
Show Author Affiliations
Hans-Ulrich Kaeufl, European Southern Observatory (Germany)
Karl Kuehl, Fraunhofer Institut fuer Festkoerpertechnologie (Germany)
Steffan Vogel, Fraunhofer Institut fuer Festkoerpertechnologie (Germany)


Published in SPIE Proceedings Vol. 3354:
Infrared Astronomical Instrumentation
Albert M. Fowler, Editor(s)

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