High-frequency Bragg gratings in a photothermorefractive glass

Holographic UV mirrors were recorded in a volume of photothermorefractive g lass. This photosensitive silicate glass doped with silver, cerium, and flu orine is transparent in the near-UV, visible, and near-IR spectral regions, and its induced refractive-index change reaches 10(-3). UV radiation of a He-Cd laser at 325 nm was used for Bragg grating recording with a spatial f requency of similar to 9200 mm(-1). The absolute diffraction efficiency of the recorded mirror reached 12.6% at 325 nm and did not deteriorate under t he long-time effects of optical irradiation and heating up 400 degreesC. (C ) 2000 Optical Society of America.