| Autor: |
Tomashuk, Alexander L., Kashaykin, Pavel F., Semjonov, Sergei L., Filippov, Aleksey V., Bychkova, Ekaterina A., Galanova, Sofiya V., Zavyalov, Nikolay V., Azanova, Irina S., Vokhmyanina, Olga L., Pospelova, Elena A., Sharonova, Yulia O., Dimakova, Tatiana V., Voloshin, Viktor V., Vorobev, Igor L., Kolosovskii, Alexander O., Chamorovskiy, Yuri K. |
| Zdroj: |
Journal of Lightwave Technology; 10/15/2020, Vol. 38 Issue 20, p5817-5824, 8p |
| Abstrakt: |
For the first time, radiation-induced absorption (RIA) of light is compared in two types of polarization-maintaining PANDA fibers having 1) undoped-silica core and F-doped-silica cladding, or 2) N-doped-silica core and undoped-silica cladding. RIA at λ = 1.55 μm is compared under γ-irradiation and post-irradiation recovery at room temperature (RT) and −60 °C. The post-irradiation RIA decay at RT is used to extrapolate RIA to the postulated end of the PANDA space mission (15 years) with the help of the “nth-order kinetic” model. The RIA extrapolation values for both PANDA types are found to be comparable. RIA spectra are measured in the PANDAs in the spectral range ∼0.5–4 eV in the process of both γ-irradiation and recovery; then the spectra are deconvolved into Gaussians components. The RIA spectra of both PANDA types are found to be composed of inherent and strain-assisted self-trapped holes (STHs), some undoped PANDAs demonstrating, in addition, a long-wavelength RIA tail affecting λ = 1.55 μm. No N-related color centers are revealed. Finally, RIA at λ = 1.55 μm is compared upon pulsed-X-ray irradiation. Undoped PANDAs are found to feature much smaller RIA at RT at post-pulse times larger than ∼40–1000 μs, whereas at smaller times, an N-doped PANDA proved to be superior. At −60 °C and at t > 1 ms, both PANDA types demonstrate approximately equal RIAs. Thus, the experiments showed that the two PANDA types are quite comparable, each type having its own advantages and disadvantages. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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