Measurement of UV-induced Birefringence by Thermal Annealing of a Distributed Bragg Reflector Fiber Laser
NAVAL RESEARCH LAB WASHINGTON DC WASHINGTON United States
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The photoinduced index change of a grating in a distributed Bragg reflector DBR fiber laser was annealed at temperatures up to 700 deg C. In monitoring the longitudinal modes of the laser during annealing, two distinct emission bands emerged, representing the polarization dependent reflectivities of the grating being thermally processed. By fitting the emission bands to a Gaussian, a measure of the fibers nominal 7 x 10expn-6 and induced 5 x 10expn-6 birefringence was determined.
- Lasers and Masers