Abstract

Further power scaling and stable laser performance were demonstrated in the Yb/Ce codoped aluminosilicate fiber fabricated through low-temperature chelate gas phase deposition technique. The molar ratio of Ce/Yb was designed and optimized to be 0.58 for low background loss, effective photodarkening suppression, and no additional thermal load. The background loss of this active fiber was 4.7 dB/km and its photodarkening loss at equilibrium was as low as 3.9 dB/m at 633 nm. Benefiting from low-temperature deposition technique, the fiber showed uniform core composition devoid of clustering and central ‘dip’ of refractive index profile and 0.19 mol% Yb₂O₃ was homogeneously dissolved into the fiber core plus with 0.41 mol% Al₂O₃, 0.11 mol% Ce₂O₃, and 0.32 mol% SiF₄. Based on a master oscillator power amplifier laser setup, 5.04 kW laser output at 1079.80 nm was achieved with a slope efficiency of 81.1%. Stabilized at 5kW-level laser for over 60 minutes, the output power presented almost no power degradation, directly confirming a noticeable photodarkening mitigation.

KW-level low photodarkening Yb/Ce codoped aluminosilicate fiber fabricated by the chelate gas phase deposition technique

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Ultra-low-loss double-cladding laser fiber fabricated by optimized chelate gas phase deposition technique

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Multi-kW Yb-doped aluminophosphosilicate fiber

Shuang Liu, Huan Zhan, Kun Peng, Yuwei Li, Shihao Sun, Jiali Jiang, Li Ni, Xiaolong Wang, Juan Yu, Lei Jiang, Rihong Zhu, Jianjun Wang, Feng Jing, and Aoxiang Lin
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Gain-tailored Yb/Ce codoped aluminosilicate fiber for laser stability improvement at high output power

Fangfang Zhang, Yibo Wang, Xianfeng Lin, Yongshi Cheng, Zhilun Zhang, Yehui Liu, Lei Liao, Yingbin Xing, Lvyun Yang, Nengli Dai, Haiqing Li, and Jinyan Li
Opt. Express 27(15) 20824-20836 (2019)

Fabrication of Yb/Ce/P co-doped fluoroaluminosilicate fiber with excellent photodarkening suppression and kW-level laser performance

Rui Liu, Dapeng Yan, Ming Chen, Jianming Wang, Jianhong Shi, and Qixin Zhu
Opt. Mater. Express 10(3) 777-786 (2020)