ROBUST OPTICAL FIBER GRATING ACHIEVED BY FEMTOSECOND LASER EXPOSURE

摘要

High temperature (up to 1000 deg C) stable and high reflectivity (99.85percent) fiber Bragg gratings are fabricated in non-sensitized SMF-28 optical fiber using femtosecond laser exposure under a phase mask. The reflectivity of the grating is basically unchanged after isochronal annealing up to 1000 deg C for long time.