Main > Chinese Optics Letters >  Volume 18 >  Issue 5 >  Page 051404 > Article
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Accepted: Jan. 10, 2020

Posted: Apr. 27, 2020

Published Online: Apr. 28, 2020

The Author Email: Encai Ji (jec12@tsinghua.org.cn)

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Encai Ji, Jie Shi, Congwen Zha, Jing Zeng, Xinwu Zhou, Zhengdi He, Yong Yao, Qitao Lü. Ultimate capacity analysis of cladding-pumped 10/130 Tm:fiber laser[J]. Chinese Optics Letters, 2020, 18(5): 051404

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## Abstract

The ultimate capacity of a cladding-pumped 10/130 Tm:fiber is experimentally investigated with a 793 nm laser diode bidirectionally pumped amplifier. The laser system works stably at the output powers of 52 W, 65 W, and 87 W. Eventually, the damage of the amplifier occurs when the output power reaches about 103.5 W with a total incident pump power of 176.8 W. Considering the incident seed power of 12.3 W, the amplifier conversion efficiency is estimated to be about 51.6% before it is damaged. With valuable exploration, we achieve the first air-cooling 60 W Tm:fiber laser at 1945.845 nm with a spectral linewidth of 0.4 nm. The laser power stability reaches 1.24% during a continuous test time of >65 h. The beam quality is measured as $Mx2=1.16$ and $My2=1.14$.