Abstract

Bragg gratings are used in several photonic devices to reflect, and thus to isolate, specific wavelengths of light. Gratings can be photoinduced in chalcogenide glasses by illumination of bandgap light in an interference pattern. We used holographic interferometry to create Bragg gratings in amorphous ${\mathrm{As}}_2{\mathrm{Se}}_3$ thin films with a period of $0.56 \mathit{\mu }\mathrm{m}$ by illumination with 633-nm light. The quality of the gratings was tested in real time, and refractive-index modulations as high as 0.037 were measured. These gratings were found to be stable over a period of several months if they were kept in the dark.

© 2003 Optical Society of America

Photoinduced refractive index change in As₂Se₃ by 633nm illumination

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