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Proceedings Paper

Atmospheric dispersion correction for the FORS Focal Reducers at the ESO VLT
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Paper Abstract

The need for atmospheric dispersion correction on large telescopes is well known. Therefore it was decided to implement atmospheric dispersion correctors for FORS, the focal reducer/spectrographs of the ESO very large telescope. The boundary conditions at the VLT Cassegrain foci excluded however all previously known ADC concepts and therefore we were forced to design a new one, the longitudinal atmospheric dispersion corrector (LADC) consisting of two thin prisms with variable distance. This design has several advantages compared to the 'classical concepts:' among others it avoids tilting the pupil axis and uses only one material (silica) which has a very high transmission over the operating wavelength range of FORS (330 - 1000 nm).

Paper Details

Date Published: 21 March 1997
PDF: 9 pages
Proc. SPIE 2871, Optical Telescopes of Today and Tomorrow, (21 March 1997); doi: 10.1117/12.269000
Show Author Affiliations
Gerardo Avila, European Southern Observatory (Germany)
Gero Rupprecht, European Southern Observatory (Germany)
Jacques Maurice Beckers, National Solar Observatory (United States)


Published in SPIE Proceedings Vol. 2871:
Optical Telescopes of Today and Tomorrow
Arne L. Ardeberg, Editor(s)

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