Abstract
Bragg gratings have been written in an optical fiber with a core made from ternary glass and a cladding. The presence of allows for higher concentrations of , which are believed to be responsible for the photorefractive response of this composition. In these preliminary experiments significant refractive-index modulations, up to , have been achieved with a 248-nm excimer laser and a phase mask to write gratings for reflectivity at . The induced refractive-index changes show enhanced temperature stability, and there is no sign of any erasure up to temperatures exceeding 600 °C.
© 2000 Optical Society of America
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