Abstract

The thermal stability of Type I gratings is increased by postthermal tuning of the grating. Optimization of the procedure leads to gratings that can withstand temperatures as high as 600°C. Aging tests lead to lifetime predictions as high as 25 years with <3dB reduction at 400°C. Single exponential relaxation is observed. Above 800°C regeneration is obtained.

© 2010 Optical Society of America

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