The first results of the study on photobleaching and thermally induced recovery in Bi-doped phosphosilicate fiber have been presented. It was revealed that the rate of bleaching of phosphor-related Bi active center (BAC-P) becomes slower with the decrease of photon energy. The quadratic dependence of the bleaching rate of BAC-P on laser power is obtained under 532 nm laser irradiation. The effect of temperature on the bleaching dynamics of BAC-P is also investigated under 532 nm radiation, suggesting a thermally aggravated bleaching process upon heating at certain temperatures ($\ge\! {{300}}^\circ {\rm{C}}$). Furthermore, the thermal recovery of bleached Bi-doped silica-based fiber (BDF) is investigated and a 13% increase of luminescence is achieved upon thermal quenching for 5 min at 400ºC. The underlying mechanism of photobleaching and thermo-stimulated recovery process of BAC-P is also discussed.

中文翻译：

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Bi掺杂磷硅酸盐纤维中BAC-P的光诱导漂白和热刺激恢复

提出了对Bi掺杂的磷硅酸盐纤维进行光致漂白和热致恢复的研究的第一批结果。揭示了随着光子能量的减少，与磷有关的Bi活性中心（BAC-P）的漂白速度变慢。在532 nm激光照射下，BAC-P的漂白速率对激光功率的二次依赖性。还研究了温度对BAC-P漂白动力学的影响（在532 nm辐射下），这表明在一定温度下加热时，热加剧的漂白过程（$ \ ge \！{{300}} ^ \ circ {\ rm {C }} $）。此外，还研究了漂白的Bi-掺杂的二氧化硅基纤维（BDF）的热回收率，并且在400ºC下进行5分钟的热淬火后，其发光度增加了13％。还讨论了BAC-P的光漂白和热刺激回收过程的潜在机理。