Optics Communications
Volume 497, 15 October 2021, 127151

 

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

 

Yu Yamasaki1,2, 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


 

我々は,長さ40mmのNd3+添加石英ガラスシングルモードファイバー(Nd-SMF)と可飽和吸収体としてSESAMを用いることで,基本繰り返し周波数2.6GHzのパルスレーザーを構築することに成功した.これは筆者の知る限り,石英ガラスファイバレーザーの中では,最も繰り返し周波数が高い.Nd-SMFのコアガラスはゼオライト法により作製し,そのNd2O3の添加濃度は1.25 wt.%であった.レーザー最大出力は27.2 mW に達し,そのスロープ効率とレーザー発振閾値はそれぞれ,19.6 %,7.3 mW であった.発振波長は1062.7 nmであった.GHzもの高繰り返しレーザーは,光周波数コムや,アブレーションクーリングを用いたレーザー加工への応用が期待できる. 


 

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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