As_2S_3 photosensitivity by two-photon absorption: holographic gratings and self-written channel waveguides

Abstract

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.