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Instrumentation for Ground-Based Optical Astronomy pp 183–188Cite as

An Immersion Grating for an Astronomical Spectrograph

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Part of the book series: Santa Cruz Summer Workshops in Astronomy and Astrophysics ((SANTA CRUZ))

Abstract

When a reflection grating is immersed in a medium instead of in air, i.e. when it is used on the rear side of a prism, a resolving power increase of n(the index of the medium) is obtained. A further increase due to the anamorphic effect is possible by inclining the entrance face of the prism. In practice an increase in resolving power of about 2.3 compared to the same grating used in air can be reached in the visible wavelength range. Larger gains are possible in the IR due to the availability of high-index materials.

The design of an anamorphic immersion échelle for the ESO MultiMode Instru-ment (EMMI) is described. With this grating it is possible to reach a resolving power of 6.104 with a 1″ slit on ESO7#x2019;s 3.5 m NTT, using a collimated beam size of just 120 mm.

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References

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Authors
  1. Hans Dekker
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Editor information

Editors and Affiliations

  1. Lick Observatory, University of California at Santa Cruz, 95064, Santa Cruz, CA, USA

    Lloyd B. Robinson

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© 1988 Springer-Verlag New York Inc.

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Dekker, H. (1988). An Immersion Grating for an Astronomical Spectrograph. In: Robinson, L.B. (eds) Instrumentation for Ground-Based Optical Astronomy. Santa Cruz Summer Workshops in Astronomy and Astrophysics. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-3880-5_17

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  • DOI: https://doi.org/10.1007/978-1-4612-3880-5_17

  • Publisher Name: Springer, New York, NY

  • Print ISBN: 978-1-4612-8387-4

  • Online ISBN: 978-1-4612-3880-5

  • eBook Packages: Springer Book Archive

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