Thermal-optical controllable thin-film device at 10.6 um

W. Richter; Udo Weinert

doi:10.1117/12.141038

4 March 1993 Thermal-optical controllable thin-film device at 10.6 μm

W. Richter, Udo Weinert

Proceedings Volume 1782, Thin Films for Optical Systems; (1993) https://doi.org/10.1117/12.141038
Event: Optical Systems Design '92, 1992, Berlin, Germany

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) .

Citation Download Citation

W. Richter and Udo Weinert "Thermal-optical controllable thin-film device at 10.6 μm", Proc. SPIE 1782, Thin Films for Optical Systems, (4 March 1993); https://doi.org/10.1117/12.141038

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available