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21 March 1997Atmospheric dispersion correction for the FORS Focal Reducers at the ESO VLT
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Gerardo Avila,1 Gero Rupprecht,1 Jacques Maurice Beckers2

1European Southern Observatory (Germany)
2National Solar Observatory (United States)
Proceedings Volume 2871, Optical Telescopes of Today and Tomorrow; (1997)https://doi.org/10.1117/12.269000
Event: Optical Telescopes of Today and Tomorrow, 1996, Landskrona/Hven, Sweden
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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).
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Gerardo Avila,Gero Rupprecht, andJacques Maurice Beckers"Atmospheric dispersion correction for the FORS Focal Reducers at the ESO VLT", Proc. SPIE 2871, Optical Telescopes of Today and Tomorrow, (21 March 1997);https://doi.org/10.1117/12.269000
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Cited by 28 scholarly publications.
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KEYWORDS
Prisms
Telescopes
Atmospheric corrections
Image quality
Dispersion
Large telescopes
Observatories
Stars
Image resolution
Silica
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Gerardo Avila, Gero Rupprecht, Jacques Maurice Beckers, "Atmospheric dispersion correction for the FORS Focal Reducers at the ESO VLT," Proc. SPIE 2871, Optical Telescopes of Today and Tomorrow, (21 March 1997); https://doi.org/10.1117/12.269000
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