Nonlinear absorption of laser pulses in amorphous and crystalline As2S3 thin films

Valentin N. Chumash; G. Bostan; Ion A. Cojocaru; Niculae E. Mincu; P. Cerbari

doi:10.1117/12.226170

3 November 1995 Nonlinear absorption of laser pulses in amorphous and crystalline As₂S₃ thin films

Valentin N. Chumash, G. Bostan, Ion A. Cojocaru, Niculae E. Mincu, P. Cerbari

Proceedings Volume 2648, International Conference on Optical Diagnostics of Materials and Devices for Opto-, Micro-, and Quantum Electronics; (1995) https://doi.org/10.1117/12.226170
Event: International Conference on Optical Diagnostics of Materials and Devices for Opto-, Micro-, and Quantum Electronics, 1995, Kiev, Ukraine

Abstract

Results of the experimental investigations of absorption of laser pulses in amorphous (a-) and crystalline (c-) 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 are reported. 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 As₂S₃ films can confirm the proposed explanation.

Citation Download Citation

Valentin N. Chumash, G. Bostan, Ion A. Cojocaru, Niculae E. Mincu, and P. Cerbari "Nonlinear absorption of laser pulses in amorphous and crystalline As₂S₃ thin films", Proc. SPIE 2648, International Conference on Optical Diagnostics of Materials and Devices for Opto-, Micro-, and Quantum Electronics, (3 November 1995); https://doi.org/10.1117/12.226170

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