Abstract
We present the characterization of nonlinear optical parameters of chalcogenide films (As2 S3, As20 S80, 2As2 S3/As2 Se3, 3As2 S3/As2 Se3). We have measured their nonlinear refractive indices and two-photon absorption coefficients using the Z-scan method at the wavelengths of picosecond Nd:YAG laser radiation (1064 nm and 532 nm). We have analysed numerically the optical limiting of chalcogenide films due to the Kerr-induced nonlinearities, and in the case of 2As2 S3/As2 Se3 we found 12.5-fold limiting. We present the experimental results on optical limiting due to two-photon absorption. We obtained 25-fold optical limiting in the case of As2 S3. We discuss the variations of nonlinear optical properties of chalcogenide films.
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