Radiation induced attenuation in pure silica polarization maintaining fibers
| Autor: | Elena A. Pospelova, P. F. Kashaykin, Igor A. Maltsev, Olga M. Tatsenko, A.L. Tomashuk, O.V. Zverev, E. M. Dianov, A.V. Filippov, Yu. O. Sharonova, Irina S. Azanova, N.S. Kuzyakina, Olga L. Vokhmyanina, Tatiana V. Dimakova |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Optical fiber Birefringence Materials science Attenuation Composite number Polarization-maintaining optical fiber 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Polarization (waves) 01 natural sciences Molecular physics Rod Electronic Optical and Magnetic Materials law.invention law 0103 physical sciences Materials Chemistry Ceramics and Composites Irradiation 0210 nano-technology |
| Zdroj: | Journal of Non-Crystalline Solids. 508:26-32 |
| ISSN: | 0022-3093 |
| Popis: | Radiation-induced attenuation (RIA) at λ = 1.55 μm is studied in polarization-maintaining (PM) pure-silica-core optical fibers of the Panda-type under γ-irradiation and upon pulsed-X-ray-irradiation. For the first time, the RIA spectrum is compared under γ-irradiation in a Panda and in a non-PM fiber drawn from the same preform before embedding the stress-applying rods. It is found out that the chief RIA origins in the near-IR range in both fibers are an extremely short-lived band centered at ~1 eV and the tails of the classical bands due to strain-assisted self-trapped holes (STHs) at 1.63 and 1.88 eV. The former band is found to be many times more intense in the Panda; the latter bands, somewhat more intense in the non-PM fiber. The ~1-eV band proved to be composed of two Gaussian sub-bands centered at 0.95 and 1.12 eV. Under γ-irradiation, the composite ~1-eV band is found to be photobleached virtually fully by 1.55-μm light of 5-mW power, which results in manifold reduction of the total RIA. Upon pulsed irradiation, RIA in Pandas at large post-pulse times (>1 ms–1 s) is found to fall off below the record low level demonstrated elsewhere by a non-PM pure-silica-core fiber. This fact is explained as being due to a smaller concentration of strain-assisted STHs in Pandas than in non-PM fibers. The concentration of strain-assisted STHs in Pandas is shown to increase with increasing the value of birefringence. |
| Databáze: | OpenAIRE |
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