Gain-tailored Yb/Ce codoped aluminosilicate fiber for laser stability improvement at high output power

A gain-tailored Ge-free Yb/Ce codoped aluminosilicate fiber is fabricated by MCVD combined with solution doping technique. Through regulating the temperature in the tube and designing the solution doping process, the refractive index profile of this fiber is close to a step-index without any center...

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Published in:Optics express 2019-07, Vol.27 (15), p.20824-20836
Main Authors: Zhang, Fangfang, Wang, Yibo, Lin, Xianfeng, Cheng, Yongshi, Zhang, Zhilun, Liu, Yehui, Liao, Lei, Xing, Yingbin, Yang, Lvyun, Dai, Nengli, Li, Haiqing, Li, Jinyan
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cited_by cdi_FETCH-LOGICAL-c372t-2132ac426236be3c101b9fd824576aca07ca2b118d6031cf3393db9793fafb6e3
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container_end_page 20836
container_issue 15
container_start_page 20824
container_title Optics express
container_volume 27
creator Zhang, Fangfang
Wang, Yibo
Lin, Xianfeng
Cheng, Yongshi
Zhang, Zhilun
Liu, Yehui
Liao, Lei
Xing, Yingbin
Yang, Lvyun
Dai, Nengli
Li, Haiqing
Li, Jinyan
description A gain-tailored Ge-free Yb/Ce codoped aluminosilicate fiber is fabricated by MCVD combined with solution doping technique. Through regulating the temperature in the tube and designing the solution doping process, the refractive index profile of this fiber is close to a step-index without any center dip. The laser performance of this fiber is proved through contrast experiments with conventional fiber in a kW-level MOPA setup. The gain-tailored fiber amplifier presents a beam quality of M ~1.43 at 1.2 kW. Its MI threshold is 1.25 kW, about 1.74 times as much as that of the conventional fiber amplifier. The laser slope efficiency of the gain-tailored fiber amplifier is 86.75%. Stabilized at an output power of 1.1 kW for 15 hours, the MI threshold does not decrease after this long-term operation, demonstrating a strong resistance to photodarkening effect. These results have confirmed that MCVD-fabricated gain-tailored Yb/Ce codoped aluminosilicate fibers have great potential in power scaling and output stability of high-power fiber lasers and amplifiers.
doi_str_mv 10.1364/OE.27.020824
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title Gain-tailored Yb/Ce codoped aluminosilicate fiber for laser stability improvement at high output power
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