Grisms from germanium/silicon for astronomical instruments

Hans-Ulrich Kaeufl; Karl Kuehl; Steffan Vogel

doi:10.1117/12.317257

21 August 1998 Grisms from germanium/silicon for astronomical instruments

Hans-Ulrich Kaeufl, Karl Kuehl, Steffan Vogel

Proceedings Volume 3354, Infrared Astronomical Instrumentation; (1998) https://doi.org/10.1117/12.317257
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

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.

Citation Download Citation

Hans-Ulrich Kaeufl, Karl Kuehl, and Steffan Vogel "Grisms from germanium/silicon for astronomical instruments", Proc. SPIE 3354, Infrared Astronomical Instrumentation, (21 August 1998); https://doi.org/10.1117/12.317257

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