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Optics Communications

Switching times in absorptive optical bistability

Paul Mandel, Thomas Erneux

Published Aug 1, 1982• 16 citations
Publisher
DOI
10.1016/0030-4018(82)90249-8

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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Oct 28, 1992•1 citation
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.
Saturating absorption and optical bistability (OB) with ns switching time in Langmuir-Blodgett (LB) films of phthalocyanines derivatives on reflection have been studied at room temperature (RT) in the near ultraviolet region for the first time. The saturating intensity (Is) and switching intensity for the OB at 337.1 nm are about 1 MW/cm2 and 5 MW/cm2, respectively. The experimental results show that the major nonlinear and positive feedback mechanisms for the OB are the change of refractive index caused by the saturating absorption and the simple F-P cavity due to the natural faces of the sample, respectively.