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Le Journal de Physique Colloques

THEORETICAL ANALYSIS OF TRANSVERSE AND CROSSTALK EFFECTS IN THERMOOPTIC ABSORPTIVE BISTABILITY

Jean Oberlé, J.‐Y. Bigot, A. Daunois

Published Jun 1, 1988• 1 citation
Publisher

Abstract

We study the influence of the transverse and longitudinal propagation of heat on the switching dynamics of a thermooptic absorptive bistable device monitored by a cw laser beam and adressed by an external pulse of short duration. Crosstalk effects between two adjacent pixels are discussed.
DOI
10.1051/jphyscol:19882104

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The switching dynamics of thermally induced optical bistability due to increasing absorption is investigated in thin CdS platelets, at room temperature. Fast and slow components can be observed during the switching process, they depend on the holding point intensity and on the switching pulse energy. It is shown that the transverse relaxation of the temperature in the sample influences this dynamics. The spectral shift of the band to band absorption edge, at the origin of the bistable behavior, is observed in a three beam experiment.
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The switching dynamics of photothermal-induced absorption optical bistability is studied in CdS. The bistable element being held near its switching threshold is switched by a pulse of an excimer laser, which can be regarded as δ shaped in time with respect to the thermal relaxation time of the sample. The dynamics of the switching process is influenced by the transverse relaxation of the temperature in the sample. Under appropriate conditions either a slowing down or a fast switching is observed.
The heat flow in evaporated thin film interference filters with CdS spacer and an optional CdSe absorption layer is investigated, analyzing the dynamics of optical bistability. The influence of the spot radius r of the exciting laser beam on the switching parameters is studied experimentally and theoretically. The response to pulsed excitation of the bistable devices can be described with a relaxation time τ~r and an effective nonlinearity χ~r−2 which is inversely proportional to the heat capacity of the bistable element.