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Optical hysteresis and light absorption in a-As2S3 and c-As2S3

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5 Author(s)
Chumash, V. ; Inst. of Appl. Phys., Acad. of Sci., Kishinev, Moldova ; Bostan, G. ; Cojocaru, I. ; Mincu, Niculae
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Results of the experimental investigations of nonlinear absorption of laser pulses in amorphous a-As2S3 films are presented. The optical transmission hysteresis and reversible film photodarkening at interband excitation of a-As2S3 films in a blue-green spectral region is reported for the first time. It was suggested that the nonlinear light absorption could be explained by taking into account the light interaction with nonequilibrium localized lattice vibrations anharmonically coupled with the extended phonons. The measurements of peculiarities of the pulse absorption in crystalline c-As2S3 films can confirm the proposed explanation

Published in:

Semiconductor Conference, 1995. CAS'95 Proceedings., 1995 International

Date of Conference:

11-14 Oct 1995