© 2026 Aqora Quantum S.A.S.

Terms Privacy Legal Notice

physica status solidi (b)

Optical Oscillations and Their Peculiarities Caused by Internal Switching Delay in Optically Bistable CdS Crystals

V. Kažukauskas, H. Ißler, J. Grohs, Claus F. Klingshirn

Published Jan 1, 1995• 3 citations

Abstract

Abstract Light oscillations due to internal switching delay in optically bistable CdS platelets are reported using a geometry with two exciting beams. It is shown that in the case when one of the exciting beams has the form of a long thin light strip, an internal delay occurs due to the final propagation speed of the bistable switching front along it (switching wave) which enables one to obtain oscillations using electrooptical feedback without external delay. If an external delay is applied to one of the beams, while the second one appears as a single light pulse peculiarities of the oscillations caused by the interaction of both delay signals are obtained, which are not observed if only one light beam is used.

DOI: 10.1002/pssb.2221870123

Related papers

CdS self-electrooptic effect device: electrooptic modulation and optical bistability at 514nm

A. Witt, M. Wegener, Claus F. Klingshirn +3 more

It has been demonstrated that thin CdS crystal platelets at room temperature may exhibit all-optical bistability under illumination with the 514nm line of an Ar+-laser1. In this case the local heating of the sample leads to induced absorption optical bistability. In the present paper we evaporate metallic contacts on CdS crystals and apply an external bias voltage. The carriers created by the incoming light lead to a photo-current which in turn increases the temperature of the sample by electrical power via Joule's heat and thereby changes the optical properties 2,3.

Topical Meeting on Optical Bistability (OB)•Jan 1, 1988•0 citations

SWITCHING DYNAMICS OF BISTABLE CdS ABSORPTIVE PLATELETS

J.‐Y. Bigot, A. Daunois, Noureddine Cherkaoui Eddeqaqi +3 more

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.

Le Journal de Physique Colloques•Jun 1, 1988•1 citation

Optical Bistability And Nonlinear Dynamics In CdS And Related Materials

M. Wegener, Claus Dörnfeld, M. Lambsdorff +2 more

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.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Oct 14, 1986•6 citations

Intrinsic absorptive optical bistability in CdS

Klaus M. Bohnert, H. Kalt, Claus F. Klingshirn

An intrinsic absorptive optical bistability is observed in the transmission of high intensity, nanosecond laser pulses through thin CdS platelets at liquid helium temperature. The bistability is due to a renormalization of the band gap which is caused by the formation of an electron hole plasma and occurs in a broad spectral range below the excitonic resonances. The switching times are in the subnanosecond range. The dependence on photon energy is investigated and discussed.

Applied Physics Letters•Dec 15, 1983•105 citations

Optical Bistability in CDS

M. Wegener, A. Witt, Claus F. Klingshirn +7 more

Optical bistability (OB) has potential applications in optoelectronics [1]. Beside electronic OB, which is usually fast, also photo-thermal OB often has been investigated [1]. Its main disadvantage are switching times in the μs-ms regime. In particular thin (a few μm) CdS single crystal platelets show photothermal OB due to induced absorption at room temperature at 514nm.

Nonlinear Optical Properties of Materials•Jan 1, 1988•0 citations

All-optical bistability in luminescence of thin CdS films

B. Ullrich, Takayoshi Kobayashi

Recently, we have discovered that the excitation of thin CdS films with the 514.5 nm line causes an all-optical bistable luminescent emission in the near infrared part of the spectrum. A first insight in mechanism and origin of all-optical bistability in luminescence of semiconductors is presented. We show that the initial and final states of the bistable luminescence are determined by the thermal properties of the luminescence intensity of the thin CdS film. However, during the bistable switch of the luminescence thermal effects and electronic ones take place. Thus, all-optical bistability in luminescence is a thermally induced electronic bistability.

Physica Scripta•Jan 1, 1994•2 citations

Abstract Light oscillations due to internal switching delay in optically bistable CdS platelets are reported using a geometry with two exciting beams. It is shown that in the case when one of the exciting beams has the form of a long thin light strip, an internal delay occurs due to the final propagation speed of the bistable switching front along it (switching wave) which enables one to obtain oscillations using electrooptical feedback without external delay. If an external delay is applied to one of the beams, while the second one appears as a single light pulse peculiarities of the oscillations caused by the interaction of both delay signals are obtained, which are not observed if only one light beam is used.

It has been demonstrated that thin CdS crystal platelets at room temperature may exhibit all-optical bistability under illumination with the 514nm line of an Ar+-laser1. In this case the local heating of the sample leads to induced absorption optical bistability. In the present paper we evaporate metallic contacts on CdS crystals and apply an external bias voltage. The carriers created by the incoming light lead to a photo-current which in turn increases the temperature of the sample by electrical power via Joule's heat and thereby changes the optical properties 2,3.

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.

Recently, we have discovered that the excitation of thin CdS films with the 514.5 nm line causes an all-optical bistable luminescent emission in the near infrared part of the spectrum. A first insight in mechanism and origin of all-optical bistability in luminescence of semiconductors is presented. We show that the initial and final states of the bistable luminescence are determined by the thermal properties of the luminescence intensity of the thin CdS film. However, during the bistable switch of the luminescence thermal effects and electronic ones take place. Thus, all-optical bistability in luminescence is a thermally induced electronic bistability.