Study of radiation-induced spectral changes of femtosecond laser written FBG in metal and polyimide coated fiber

A. V. Dostovalov; A. A. Wolf; V. A. Simonov; M. V. Korobeynikov; A. Bryazgin; P. F. Kashaykin; S. S. Yakushin; M. Mikhailenko; S. A. Babin

doi:10.1117/12.2555818

1 April 2020 Study of radiation-induced spectral changes of femtosecond laser written FBG in metal and polyimide coated fiber

A. V. Dostovalov, A. A. Wolf, V. A. Simonov, M. V. Korobeynikov, A. Bryazgin, P. F. Kashaykin, S. S. Yakushin, M. Mikhailenko, S. A. Babin

Author Affiliations +

Proceedings Volume 11354, Optical Sensing and Detection VI; 113542J (2020) https://doi.org/10.1117/12.2555818
Event: SPIE Photonics Europe, 2020, Online Only

Abstract

The influence of β-radiation exposure (the total dose up to 41.1 MGy and dose rate of 2.5 kGy/s) on the spectral characteristics of high and low reflective FBGs inscribed using femtosecond laser radiation in Ge-doped and pure-silica core fibers with polyimide and metal coating is presented. The largest Bragg wavelength induced shift (BWS) of +55 pm is observed in the case of weak reflective FBG (type I) inscribed in Ge-doped fiber. A comparable red shift in wavelength of + 50 pm is observed in the case of high reflective FBG (type II), which is explained by an increase in the concentration of GeE’-centers and, accordingly, an increase in the effective refractive index. Moreover, a significantly smaller BWS of -10 pm was obtained in the case of high reflective FBGs inscribed in pure-silica core fibers.

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A. V. Dostovalov, A. A. Wolf, V. A. Simonov, M. V. Korobeynikov, A. Bryazgin, P. F. Kashaykin, S. S. Yakushin, M. Mikhailenko, and S. A. Babin "Study of radiation-induced spectral changes of femtosecond laser written FBG in metal and polyimide coated fiber", Proc. SPIE 11354, Optical Sensing and Detection VI, 113542J (1 April 2020); https://doi.org/10.1117/12.2555818

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