TY - JOUR

T1 - Investigation of pump scheme on the dynamics of brightness-enhanced random Raman fiber lasers

AU - Fan, Chenchen

AU - Wu, Jian

AU - Yao, Tianfu

AU - Xiao, Hu

AU - Xu, Jiangming

AU - Leng, Jinyong

AU - Zhou, Pu

AU - Wolf, Alexey A.

AU - Nemov, Ilya N.

AU - Kuznetsov, Alexey G.

AU - Babin, Sergey A.

N1 - The authors thank Prof. Zilun Chen for providing the fiber end cap, thank Mr. Liang Xiao for technical supporting in the experiments. This work was funded by National Natural Science Foundation of China ( 12174445 , 62061136013 , 61905284 ), Russian Science Foundation ( 21-42-00019 ).

PY - 2024/5

Y1 - 2024/5

N2 - Random Raman fiber laser (RRFL) has received a lot of interests and found numerous applications due to their unique properties on simple structure, wavelength flexibility, and mode-free feature. However, RRFLs with brightness enhancement (BE) face limitations in output power, typically remaining within a few hundred watts due to inadequate pump absorption and higher-order Stokes generation. Herein, we investigate the impact of pump scheme on the dynamics of RRFL with BE, leveraging various pump sources for the first time. A comprehensive investigation encompassing the output spectrum, linewidth, and beam quality of RRFLs has been conducted, revealing intriguing insights. Remarkably, it is discovered that pumping with amplified spontaneous emission source facilitates a narrower linewidth, superior beam quality, and a higher BE factor. At the same time, the achieved signal power scales up to an impressive 722W. It is even higher (1013W) with laser pumping at the expense of other parameters deterioration. This remarkable power achievement sets a record for GRIN fiber-based RRFLs, underscoring their significant potential in pushing the boundaries of high-power laser systems. The findings presented in this study contribute to the advancement of RRFL technology, paving the way for further exploration of its capabilities in a wide range of applications necessitating heightened performance and power scalability.

AB - Random Raman fiber laser (RRFL) has received a lot of interests and found numerous applications due to their unique properties on simple structure, wavelength flexibility, and mode-free feature. However, RRFLs with brightness enhancement (BE) face limitations in output power, typically remaining within a few hundred watts due to inadequate pump absorption and higher-order Stokes generation. Herein, we investigate the impact of pump scheme on the dynamics of RRFL with BE, leveraging various pump sources for the first time. A comprehensive investigation encompassing the output spectrum, linewidth, and beam quality of RRFLs has been conducted, revealing intriguing insights. Remarkably, it is discovered that pumping with amplified spontaneous emission source facilitates a narrower linewidth, superior beam quality, and a higher BE factor. At the same time, the achieved signal power scales up to an impressive 722W. It is even higher (1013W) with laser pumping at the expense of other parameters deterioration. This remarkable power achievement sets a record for GRIN fiber-based RRFLs, underscoring their significant potential in pushing the boundaries of high-power laser systems. The findings presented in this study contribute to the advancement of RRFL technology, paving the way for further exploration of its capabilities in a wide range of applications necessitating heightened performance and power scalability.

KW - Fiber laser

KW - Graded-index fiber

KW - Stimulated Raman scattering

KW - Temporal stability

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85181400600&origin=inward&txGid=2dfced835e0843e17f2d360c20527af4

UR - https://www.mendeley.com/catalogue/36155b46-6184-3839-9280-05916e88cf25/

U2 - 10.1016/j.optlastec.2023.110507

DO - 10.1016/j.optlastec.2023.110507

M3 - Article

VL - 172

JO - Optics and Laser Technology

JF - Optics and Laser Technology

SN - 0030-3992

M1 - 110507

ER -