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

Details Atmospheric dispersion correction for the FORS Focal Reducers at the ESO VLT Atmospheric dispersion correction for the FORS Focal Reducers at the ESO VLT

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spie.2871.1135a&link_type=abstract

Proc. SPIE Vol. 2871, p. 1135-1143, Optical Telescopes of Today and Tomorrow, Arne L. Ardeberg; Ed.

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Scientific paper

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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