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Selection of LP01 and LP11 modes in multimode graded-index fiber Raman laser by special FBGs
Author(s): Alexey G. Kuznetsov; Alexey A. Wolf; Alexandr V. Dostovalov; Sergey I. Kablukov; Sergey A. Babin
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Paper Abstract

Output beam characteristics of a LD-pumped multimode graded-index fiber Raman laser with different cavity configurations are studied. It has been shown that specially designed 976-nm FBGs inscribed by femtosecond pulses enable selection of an individual transverse mode: fundamental LP01 mode is generated in case of FBG localized in the center of graded-index fiber core, whereas next-order LP11 mode is generated in case of FBG shifted by ~8 um from the center. Corresponding beam shapes and spectra are observed in the laser output. At that, output power at the same pumping is sufficiently higher in case of LP11 FBG. Optimization of output characteristics is also performed resulting in generation of ~50 W power at 976 nm with beam quality parameter M2≈2.

Paper Details

Date Published: 19 November 2019
PDF: 7 pages
Proc. SPIE 11181, High-Power Lasers and Applications X, 1118111 (19 November 2019); doi: 10.1117/12.2538637
Show Author Affiliations
Alexey G. Kuznetsov, Institute of Automation and Electrometry (Russian Federation)
Alexey A. Wolf, Institute of Automation and Electrometry (Russian Federation)
Novosibirsk State Univ. (Russian Federation)
Alexandr V. Dostovalov, Institute of Automation and Electrometry (Russian Federation)
Novosibirsk State Univ. (Russian Federation)
Sergey I. Kablukov, Institute of Automation and Electrometry (Russian Federation)
Novosibirsk State Univ. (Russian Federation)
Sergey A. Babin, Institute of Automation and Electrometry (Russian Federation)
Novosibirsk State Univ. (Russian Federation)


Published in SPIE Proceedings Vol. 11181:
High-Power Lasers and Applications X
Ruxin Li; Upendra N. Singh; Shibin Jiang, Editor(s)

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