Annealing of High-Temperature Stable Hydrogen Loaded Fiber Bragg Gratings

作者:Alqarni Sondos A*; Bernier Martin*; Smelser Christopher W*
来源:IEEE Photonics Technology Letters, 2016, 28(9): 939-942.
DOI:10.1109/LPT.2016.2518798

摘要

We compare the isothermal and isochronal annealing response of ultrafast laser-induced first-order gratings to that of the third-order gratings up to 1000 degrees C. Both devices are written in H-2-loaded SMF-28 fiber with low-energy femtosecond laser pulses. With the first-order gratings, we observed a regeneration process that allows for a final peak index change of roughly 4% of the original grating. A high-temperature stable peak reflectivity of 39% is obtained (-2.14-dB transmission loss). The third-order gratings do not anneal out completely (they do not regenerate) and roughly 26% of the device persists at 1000 degrees C corresponding to a final peak reflectivity of 24% (-1.17-dB transmission loss). Due to their similar fabrication conditions, these findings suggest a strong link between the regenerated first-order gratings and the stable third-order devices. We estimate that both first-and third-order gratings of similar to 4.5 mm in length are good candidates for the development of high-temperature stable fiber sensors.

  • 出版日期2016-5-1

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