Abstract
We have performed precise measurements of the transient optical absorption spectra of amorphous (a-) As2Se3 and As2S3 at room temperature in the nanosecond and microsecond domains. From the measurements, we have observed the photodarkening in the nanosecond and microsecond domains for both of the samples. For a-As2Se3, a broad absorption peak in the range from 420 to 730nm was observed. The peak maximum changed to longer wavelength with time. For a-As2S3, a sharp absorption peak in the range from 420 to 510nm and a long absorption tail in the range from 510 to 600nm were observed. The peak maximum does not change with time. Based on the experimental results, we discuss the nanosecond dynamics of the photodarkening in terms of the local structural changes.
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