Longitudinal dispersion compensation for the Very Large Telescope Interferometer |
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Authors: | Samuel Lévêque Bertrand Koehler Oskar von der Lühe |
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Affiliation: | (1) European southern Observatory, Karl Schwarzschild Str. 2, D-85748 Garching bei München;(2) Present address: Laboratoire des Systèmes Photoniques, Université Louis Pasteur, Ecole Nationale Supérieure de Physique de Strasbourg, France |
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Abstract: | The Very Large Telescope Interferometer [1,13] will be operated in air which will introduce small optical path fluctuations due to internal turbulence [4,6] and dispersion effects. Both may contribute to fringe contrast decrease. Longitudinal dispersion effects can be corrected by inserting an appropriate glass of variable thickness in one arm of the interferometer [3,5,11,12]. This paper presents a new method applied to VLTI in order to select the optimum glass, according to both the observing wavelength and the spectral bandpath, and to calculate its thickness. Results are presented in terms of improvement on the fringe contrast. |
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