Dong-Ning Wang. Review of femtosecond laser fabricated optical fiber high temperature sensors [Invited][J]. Chinese Optics Letters, 2021, 19(9): 091204
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Fig. 2. Change in the reflectivity of the type II-IR FBGs inscribed in normal and pre-annealed fibers over a 1300 min period at an annealing temperature of 1200°C[12].
Fig. 3. Evolutions of (a) the reflection and (b) the resonant wavelength of the pre-stressed FBGs (fabricated using 550 µJ pulse energy) over 26 h at the annealing temperature of 1200°C.
Dong-Ning Wang. Review of femtosecond laser fabricated optical fiber high temperature sensors [Invited][J]. Chinese Optics Letters, 2021, 19(9): 091204