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Proceedings Paper

Optimizing dielectric mirrors for scanning Fabry Perot interferometers with constant spectral resolution
Author(s): Clinton E. Evans
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Paper Abstract

The scanning Fabry Perot interferometer may be tuned over a considerable spectral waveband by adjusting the gap between the mirrors. However, a wide tuning range places significant demands on the design of the mirror coatings. The coatings should be all-dielectric for low absorption. They must also provide good reflectance and phase control over the tuning range. In general, both the reflectance and the phase-shift on reflection of dielectric mirrors are dispersive. This dispersion, left uncontrolled, changes the spectral resolution of a scanning Fabry Perot interferometer over the operating waveband. The mirror phase dispersion also reduces the free spectral range must be controlled in the design process to achieve operation with a reasonable number of blocking filters. However, some phase dispersion will always be present in the mirror design. It is, therefore, desirable to tune the reflectance dispersion and the remaining phase dispersion so that the combination stabilizes the spectral resolution. This paper describes a suitable optimization method. It takes advantage of some features of the Fabry Perot equations to provide error terms for mirror optimization that target a specific spectral resolution value. The paper includes the theory and provides some numerical examples.

Paper Details

Date Published: 9 December 2004
PDF: 8 pages
Proc. SPIE 5578, Photonics North 2004: Photonic Applications in Astronomy, Biomedicine, Imaging, Materials Processing, and Education, (9 December 2004); doi: 10.1117/12.566466
Show Author Affiliations
Clinton E. Evans, EMS Technologies Canada Ltd. (Canada)

Published in SPIE Proceedings Vol. 5578:
Photonics North 2004: Photonic Applications in Astronomy, Biomedicine, Imaging, Materials Processing, and Education
Marc Nantel; Glen Herriot; Graham H. McKinnon; Leonard MacEachern; Robert A. Weersink; Rejean Munger; Andrew Ridsdale, Editor(s)

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