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Investigations of mode instability in large-mode-area fiber amplifier pumped by 915/976nm LD sources
Author(s): Xuexue Luo; Xiaoming Xi; Rumao Tao; Xiaolin Wang
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Paper Abstract

Detailed experimental investigations are presented on investigating mode instability and stimulated Raman scattering in 30μm core diameter fiber amplifier by varying the pumping light wavelength using 915/976nm LD sources. Results reveal that for 976nm pumping light, the highest power can reach to 3570W; and for 915nm pumping light, the highest power can reach to 3771W. Physical characteristics of mode instability do not perform in a traditional form both in output power and time domain traces, such as roll-over point in output power curve. However, the beam quality of output laser clearly reveals there are some more high-order modes which have an effect in mode instability characters. Compared to 976nm LD pumping source, laser of amplifier using 915nm LD pumping source shows stronger non-linear effect. When the output power is 3512W, the Raman light is 13dB below the signal light. By shortening the passive fiber before the endcap, when the output power is 3520W, the Raman light is 20dB.

Paper Details

Date Published: 29 March 2019
PDF: 7 pages
Proc. SPIE 11046, Fifth International Symposium on Laser Interaction with Matter, 110462G (29 March 2019); doi: 10.1117/12.2522658
Show Author Affiliations
Xuexue Luo, National Univ. of Defense Technology (China)
Xiaoming Xi, National Univ. of Defense Technology (China)
State Key Lab. of Pulsed Power Lab Technology (China)
Hunan Provincial Key Lab. of High Energy Laser Technology (China)
Rumao Tao, National Univ. of Defense Technology (China)
State Key Lab. of Pulsed Power Lab Technology (China)
Hunan Provincial Key Lab. of High Energy Laser Technology (China)
Xiaolin Wang, National Univ. of Defense Technology (China)
State Key Lab. of Pulsed Power Lab Technology (China)
Hunan Provincial Key Lab. of High Energy Laser Technology (China)


Published in SPIE Proceedings Vol. 11046:
Fifth International Symposium on Laser Interaction with Matter
YiJun Zhao, Editor(s)

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