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High absorption large-mode area step-index fiber for tandem-pumped high-brightness high-power lasers

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Abstract

A short absorption length ytterbium (Yb)-doped large-mode area (LMA) fiber is presented as a step forward to mitigate the stern problem of nonlinear scatterings in a tandem pumping scheme adopted for high-power fiber laser. The short absorption length was realized by incorporating high Yb concentration in the fiber core. Furthermore, by replacing the inherent silica cladding with a Ge-doped cladding, we were able to obtain low core numerical aperture (NA) and negate the detrimental effect of index-raising by high Yb concentrations. This overcomes the long-standing limitation in step-index Yb-doped fibers (YDFs) where high cladding absorption inevitably results in high NA, thus hampering single-mode operation. We report an LMA (575 μm2) YDF with NA of 0.04 and absorption of 27 dB/m at 976 nm—both traits promote power scaling of single-mode tandem pumped fiber lasers. To our knowledge, this is the highest cladding absorption attained in a low-NA step-index fiber to date. An all-fiber tandem-pumped amplifier was built using only 14 m of the YDF. The amplifier delivered a near-Gaussian beam (M21.27) at 836 W output power (pump power limited) with a high slope efficiency of 83%. Thanks to the short length and the tandem pumping, no indication of limiting factors such as stimulated Raman scattering, photodarkening, and transverse mode instability was observed.

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DOI:10.1364/PRJ.400755

所属栏目:Fiber Optics and Optical Communications

收稿日期:2020-06-24

录用日期:2020-08-06

网络出版日期:2020-08-10

作者单位    点击查看

Kang-Jie Lim:DSO National Laboratories, 118225 Singapore, Singapore
Samuel Kai-Wen Seah:DSO National Laboratories, 118225 Singapore, Singapore
Joash Yong’En Ye:DSO National Laboratories, 118225 Singapore, Singapore
Wendy Weiying Lim:DSO National Laboratories, 118225 Singapore, Singapore
Chu-Perng Seah:DSO National Laboratories, 118225 Singapore, Singapore
Yunn-Boon Tan:DSO National Laboratories, 118225 Singapore, Singapore
Suting Tan:DSO National Laboratories, 118225 Singapore, Singapore
Huiting Lim:DSO National Laboratories, 118225 Singapore, Singapore
Raghuraman Sidharthan:School of Electrical and Electronic Engineering, Nanyang Technological University, 639798 Singapore, Singapore
Arumugam Rajendra Prasadh:DSO National Laboratories, 118225 Singapore, Singapore
Chen-Jian Chang:School of Electrical and Electronic Engineering, Nanyang Technological University, 639798 Singapore, Singapore
Seongwoo Yoo:School of Electrical and Electronic Engineering, Nanyang Technological University, 639798 Singapore, Singapore;e-mail: seon.yoo@ntu.edu.sg
Song-Liang Chua:DSO National Laboratories, 118225 Singapore, Singapore;e-mail: csonglia@dso.org.sg

联系人作者:Seongwoo Yoo(seon.yoo@ntu.edu.sg); Song-Liang Chua(csonglia@dso.org.sg);

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引用该论文

Kang-Jie Lim, Samuel Kai-Wen Seah, Joash Yong’En Ye, Wendy Weiying Lim, Chu-Perng Seah, Yunn-Boon Tan, Suting Tan, Huiting Lim, Raghuraman Sidharthan, Arumugam Rajendra Prasadh, Chen-Jian Chang, Seongwoo Yoo, and Song-Liang Chua, "High absorption large-mode area step-index fiber for tandem-pumped high-brightness high-power lasers," Photonics Research 8(10), 1599-1604 (2020)

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