Dr. Sun Yan Profile

Dr. Sun Yan

at Shanghai Institute of Optics and Fine Mechanics

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Proceedings Article | 9 August 2021 Paper

Photodarkening in Pr3+-doped silicate glasses and fibers

Yan Sun, Xin Wang, Fei Yu, Lili Hu, Meisong Liao

Proceedings Volume 11912, 1191204 (2021) https://doi.org/10.1117/12.2601984

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Visible laser of Pr³⁺ ions doped in fluoride glass fibers has found numerous applications in display techniques, visible light communication and scientific research. Unfortunately, the poor mechanical strength, degraded chemical stability and high cost limit the further development of fluoride glasses in practice. Instead, oxide glass is good host candidate for fiber lasers due to its advantages of mature processing technique, stable chemical properties, high mechanical strength and low cost. But it is difficult to achieve laser output at visible wavelengths in Pr³⁺ doped oxide glass fiber because of photodarkening after exposure to 488 nm laser. In this work, we study such photodarkening effect and relevant mechanisms in Pr³⁺ doped silicate glasses and fibers by using X-ray and 488 nm laser as irradiation sources, respectively. Results indicate that due to relatively low energy of Pr³⁺: 4f5d, electrons of Pr³⁺ ions will be trapped to form defect (trapped hole center) through excited state absorption under exposure to both 488 nm laser and X-ray radiation.

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