Physics – Optics
Scientific paper
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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