Effect of gamma radiation dose on the performance of negative-index fiber Bragg gratings
| Autor: | Jitendra Kumar, Om Prakash, Sudhir Kumar, S.K. Dixit, Yatender Kumar Bhardwaj, Shankar V. Nakhe |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
genetic structures business.industry Annealing (metallurgy) Radiation dose General Engineering Physics::Optics 02 engineering and technology Radiation Grating 01 natural sciences Atomic and Molecular Physics and Optics 010309 optics Wavelength 020210 optoelectronics & photonics Optics Fiber Bragg grating 0103 physical sciences Thermal 0202 electrical engineering electronic engineering information engineering Physics::Atomic Physics business Refractive index psychological phenomena and processes |
| Zdroj: | Optical Engineering. 58:1 |
| ISSN: | 0091-3286 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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