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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Optical Bistability And Nonlinear Dynamics In CdS And Related Materials

M. Wegener, Claus Dörnfeld, M. Lambsdorff, F. Fidorra, Claus F. Klingshirn

Published Oct 14, 1986• 6 citations
Publisher

Abstract

We investigate optical bistability in CdS single crystal platelets and related materials either due to electronic or thermal effects, depending on the length of the excitation pulses. An induced absorber in a hybrid ring cavity with cw-input shows self oscillations.
DOI
10.1117/12.938854

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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.
In this paper we present our investigations concerning thermally induced optical bistability (OB) in CdS and ZnSe. With CdS platelet type single crystals basic boolean functions are realized. The possibilities of cascadability and parallelity of the information processing and the switching dynamics of the system are examined. Further on the effect of optical noise upon the switching process and the instable branch of the hysteresis loop are measured. In ZnSe both absorptive and dispersive OB are observed. An efficient opto-electric modulator is built using the photothermal SEED-effect.
Optical bistability (ob) is investigated in CdS in a wide range of intensities. Under pulsed excitation (total pulse width 20 nsec) we find at 5K for ħωexc ≈ 2.550 eV on the flank of the AΓ5 exciton ob of the induced absorption type for incident intensities of Iexc ≈ 1kW/cm2. The nonlinearity is in this case a collision-broadening of the free exciton resonance [1]. The commutation times τ↓ and τ↑ are about 1 nsec and 5 nsec, respectively. For ħωexc ≈ 2.546 eV we observe absorptive ob due to the formation of an electron-hole plasma [2] for Iexc ≈ 1MW/cm2. Single shot experiments show τ↓ ≲ 500 psec being thus to our knowledge one of the shortest commutation times reported for single beam ob so far. The observed hysteresis loops are compared to model calculations with variable pulse lengths. The comparison indicates true ob in our experiments.