Dielectric Fabry-Perot Mirror Coatings For Infrared Astronomy

John Trauger

doi:10.1117/12.966121

9 January 1984 Dielectric Fabry-Perot Mirror Coatings For Infrared Astronomy

John Trauger

Proceedings Volume 0445, Instrumentation in Astronomy V; (1984) https://doi.org/10.1117/12.966121
Event: 1983 Astronomy Conferences, 1983, London, United Kingdom

Abstract

A number of Fabry-Perot coating designs have been developed specifically for infrared astronomy. These have been optimized for uniform reflectance over five contiguous spectral ranges of particular astronomical interest between 1 and 5 microns. Wavelength coverage in individual designs is given by (maximum ?/minimumλ) > 1.4, over which reflective finesse is maintained near 35. Consideration has been made for the peculiar requirements of Fabry-Perot coatings. Visual alignment and testing of the Fabry-Perot has been made convenient by bringing the reflective finesse of the coating at 0.6328 μ to the same value as the main infrared reflection band. For example, a calcium fluoride FabryPerot can be aligned and tested at the 0.6328 p Hehe laser line, with the assurance of a corresponding finesse and spectral resolving power over its infrared (eg. 3.6-5.1 μ) range. In addition, the FabryPerot can be used for infrared spectroscopy while being simultaneously monitored and/or actively controlled at the laser wavelength. The potential for the coating itself to degrade the effective surface flatness of the Fabry-Perot through either mechanical stress or thickness non-uniformities is minimized by reducing to a minimum the number and thickness of coating layers. Several of these coatings have been fabricated and are actively in use at a number of observatories.

Citation Download Citation

John Trauger "Dielectric Fabry-Perot Mirror Coatings For Infrared Astronomy", Proc. SPIE 0445, Instrumentation in Astronomy V, (9 January 1984); https://doi.org/10.1117/12.966121

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