Selection of LP01 and LP11 modes in multimode graded-index fiber Raman laser by special FBGs

Alexey G. Kuznetsov; Alexey A. Wolf; Alexander V. Dostovalov; Sergey I. Kablukov; Sergey A. Babin

doi:10.1117/12.2538637

19 November 2019 Selection of LP₀₁ and LP₁₁ modes in multimode graded-index fiber Raman laser by special FBGs

Alexey G. Kuznetsov, Alexey A. Wolf, Alexander V. Dostovalov, Sergey I. Kablukov, Sergey A. Babin

Proceedings Volume 11181, High-Power Lasers and Applications X; 1118111 (2019) https://doi.org/10.1117/12.2538637
Event: SPIE/COS Photonics Asia, 2019, Hangzhou, China

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.

Citation Download Citation

Alexey G. Kuznetsov, Alexey A. Wolf, Alexander V. Dostovalov, Sergey I. Kablukov, and Sergey A. Babin "Selection of LP₀₁ and LP₁₁ modes in multimode graded-index fiber Raman laser by special FBGs", Proc. SPIE 11181, High-Power Lasers and Applications X, 1118111 (19 November 2019); https://doi.org/10.1117/12.2538637

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