Dispersion in stellar interferometry

Details Dispersion in stellar interferometry Dispersion in stellar interferometry

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apopt..29..516t&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 29, Feb. 1, 1990, p. 516-521. Research supported by the Australian Research Grants Committ

Physics

Optics

22

Astronomical Photometry, Diffraction Patterns, Interferometry, Light Scattering, Stellar Radiation, Wave Dispersion, Glass, Optical Correction Procedure, Visibility

Scientific paper

The effects of uncompensated dispersion on the fringe visibility in a two-beam interferometer are examined for a long baseline stellar interferometer with a path compensator in air rather than in vacuo. A criterion based on the central fringe visibility is derived for evaluating the effects of dispersion and develop a method for selecting suitable compensating media. By limiting the optical bandwidth to 100 nm and using a compensating system with two glasses, it is possible to achieve high fringe visibility in a stellar interferometer with excess air paths of the order of 500 m. The results are generally applicable to other two-beam interferometers.

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