Journal of Non-Crystalline Solids Volume 543, 1 September 2020, 120149

Optical properties of Er3+ heavily doped silica glass fabricated by zeolite method


Yu Yamasaki a , b,  Rieko Azuma a , Yoshio Kagebayashi a ,  Kana Fujioka c ,  Yasushi Fujimoto b , c

Ushio Inc., 1194, Sazuchi, Bessho-cho, Himeji City, Hyogo, 671-0224, Japan
b  Chiba Instituite of Technology, 2-17-1 Tsudanuma, Narashino City, Chiba, 275-0016, Japan
c Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita City, Osaka, 565-0871, Japan


 High-repetition-rate fiber lasers, ~ GHz laser, have attracted attention as light sources for high-speed laser processing, optical frequency combs, and LiDAR. For constructing a high-repetition-rate fiber laser, rare-earth ions heavily doped silica glass is required. However, rare-earth ions often forms cluster in silica glass, and reducing the fluorescence quantum yield η to several percent (= quenching). 

 For avoiding quenching, we used zeolite as a precursor (= zeolite method) and succeeded in fabricating Er3+ heavily doped silica glass. Quatum yield η was calculated to 45.1 ± 3.3% by using the Judd-Ofelt method. 


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