Effect of gamma radiation dose on the performance of negative-index fiber Bragg gratings

Jitendra Kumar; Om Prakash; Sudhir Kumar; Sudhir K. Dixit; Yatender K. Bhardwaj; Shankar V. Nakhe

doi:10.1117/1.OE.58.5.057108

31 May 2019 Effect of gamma radiation dose on the performance of negative-index fiber Bragg gratings

Jitendra Kumar, Om Prakash, Sudhir Kumar, Sudhir K. Dixit, Yatender K. Bhardwaj, Shankar V. Nakhe

Author Affiliations +

Optical Engineering, Vol. 58, Issue 5, 057108 (May 2019). https://doi.org/10.1117/1.OE.58.5.057108

Abstract

The effect of gamma radiation dose (∼1 MGy) on the performance of negative-index fiber Bragg grating (FBG) formed by prolong UV laser exposure (type-IIa grating) and prolong thermal exposure (thermally regenerated grating) is presented for the first time. It is observed that for both negative-index gratings, the radiation-induced shift in Bragg wavelength and temperature sensitivity were less than 37 pm and 0.06 pm / ° C, respectively. The performance of negative-index grating is also compared with that of positive-index grating (type-I) under the same gamma irradiation conditions. It is observed that variation in Bragg wavelength, reflection intensity, and temperature sensitivity was lower in negative-index gratings compared to that of positive-index grating. The effect of radiation is analyzed in terms of “radiation-optic coefficient” for all FBGs. The different behavior of the FBG is linked with a different mechanism responsible for the formation of negative- and positive-index FBGs.

Citation Download Citation

Jitendra Kumar, Om Prakash, Sudhir Kumar, Sudhir K. Dixit, Yatender K. Bhardwaj, and Shankar V. Nakhe "Effect of gamma radiation dose on the performance of negative-index fiber Bragg gratings," Optical Engineering 58(5), 057108 (31 May 2019). https://doi.org/10.1117/1.OE.58.5.057108

Received: 14 March 2019; Accepted: 9 May 2019; Published: 31 May 2019

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