We observed two-photon-induced refractive-index changes in As2S3 by exposure in the 800-nm region. We studied this photosensitivity by writing interference gratings on a 2-μm As2S3 thin film. This property is the key to creating self-written channel waveguides in a planar As2S3 slab.
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A. Villeneuve (1998) studied this question.
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