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A novel optical device based on a ’’dynamical refractive-index change’’ in an amorphous As2S3 film is constructed. In this device coupling of a red light beam into the thin-film waveguide with a prism coupler is controlled by illuminating blue light. A switching time of about 10 s and an on/off ratio as high as 6/1 have been achieved. Further, this device can be operated as a photo-optical switch having a storage function by changing the intensity of the light beams.
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Tanaka et al. (1981) studied this question.
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