Optics Communications
Volume 497, 15 October 2021

2.6-GHz fundamental repetition rate, Q-switched mode-locking Nd3+-doped single-mode silica fiber laser, fabricated by zeolite method 


YuYamasaki1,2, Yoshio Kagebayashi1, Takayuki Hiraishi1, Kana Fujioka3, Yasushi Fujimoto2,3


 1Ushio Inc., 1194, Sazuchi, Bessho-cho, Himeji City, Hyogo, 671-0224, Japan
2Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino City, Chiba, 275-0016, Japan
3Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita City, Osaka, 565-0871, Japan

We have successfully constructed a 2.6GHz pulse laser by using a 40 mm long Nd3+ heavily doped silica glass single-mode fiber (Nd-SMF) and SESAM as a saturable absorber. As far as we know, this is the highest repetition frequency among silica glass fiber lasers. The Nd-SMF core glass was prepared by the zeolite method, and the Nd2O3 was 1.25 wt.%. The maximum laser power reached 27.2 mW, and its slope efficiency was 19.6 %. The laser oscillation wavelength was 1062.7 nm. This GHz lasers are expected to apply light source for laser processing of ablation cooling, optical frequency combs and so on.  

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