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Journal of Applied Physics

Single-pixel bistability with nonlinear interference filters

E. Abraham, Ajoy Kumar Kar, M. R. Suttie, R. M. Harris, Andrew Walker, Stanley Desmond Smith

Published Oct 1, 1988• 4 citations
Publisher

Abstract

We present a theoretical model describing a pixellated, optically bistable, interference filter illuminated by a Gaussian beam. Preliminary experiments using ZnSe devices and 514-nm wavelength radiation show good agreement with this model for pixels of area 80×100 μm2 and a depth of 60 μm. Critical powers and cooling rates are presented for different combinations of materials and pixel dimensions.

DOI
10.1063/1.341523

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Annual Meeting Optical Society of America•Jan 1, 1989•0 citations
We present a theoretical model describing a pixellated, optically bistable, interference filter illuminated by a Gaussian beam. Preliminary experiments using ZnSe devices and 514-nm wavelength radiation show good agreement with this model for pixels of area 80×100 μm2 and a depth of 60 μm. Critical powers and cooling rates are presented for different combinations of materials and pixel dimensions.
We observe and compare conditions for cw optical bistability in both thermal-vacuum-deposited and molecular beam grown ZnSe-based interference filters, at He–Ne-laser (633-nm), Kr (647-nm), and Ar-ion (514-nm) wave-lengths. Bistability is observed at 514 and 647 nm and, by inference, should be observable at a number of intervening wavelengths for a single molecular-beam-grown sample. From our theoretical analysis we also demonstrate that observed drift instabilities in filter nonlinear responses correlate with the highest internal irradiance levels.
The optical bistabilities of ZnSe and ZnS interference filters have been studied since 1977 when Karpushko and Sinitsyn reported the first experimental results. We see from papers published that (a) it is appropriate to study and compute optical bistabilities of interference filters by a Fabry-Perot resonator; (b) during the fabrication of bistable optical devices (BOD) the parameters such as incident angles, transmission power, and influence of peak position error on BOD, etc. were not studied in detail; (c) the authors could not resolve the problems of transmission peak height for large absorption materials such as ZnSe. We propose a new method of designing BODs of interference filters to study these problems precisely.