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Proceedings Paper

Thermal-optical controllable thin-film device at 10.6 um
Author(s): W. Richter; Udo Weinert
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Paper Abstract

A sharp spectral rise in reflectance or transmittance of a suitable thin film filter can be used to construct a thermo-optical controllable mirror or phase retarder. A Fabry-Perot filter or a (lambda) /4-multilayer stack are such devices. Because of its comparatively high temperature dependence of refractive index Germanium is used as the active substance. The design wavelength is 10.6 micrometers . Reflectance of the filter can be tuned either in a quasistatic way by temperature variation of the whole device or in a dynamic regime with light pulses of visible spectral range which are strongly absorbed in Germanium. This increases temperature and causes a transmission change by displacing the resonance peak of the Fabry-Perot. Thermal relaxation time is of about 10 microsecond(s) .

Paper Details

Date Published: 4 March 1993
PDF: 5 pages
Proc. SPIE 1782, Thin Films for Optical Systems, (4 March 1993); doi: 10.1117/12.141038
Show Author Affiliations
W. Richter, Friedrich-Schiller-Univ. Jena (Germany)
Udo Weinert, Friedrich-Schiller-Univ. Jena (Germany)

Published in SPIE Proceedings Vol. 1782:
Thin Films for Optical Systems

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