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Theoretical and experimental studies on intermodal nonlinear effects of a high-power near-single-mode CW Yb-doped fiber laser

Authors :
Lu Yin
Zhigang Han
Rong Shu
Source :
Optics Express. 31:10840
Publication Year :
2023
Publisher :
Optica Publishing Group, 2023.

Abstract

An intermodal-nonlinearity-induced time-frequency evolution model of high-power near-single-mode continuous-wave fiber lasers (NSM-CWHPFLs) was proposed to simulate the evolution of spectral characteristics and beam quality under the combined action of intermodal and intramodal nonlinear effects. The influence of fiber laser parameters on intermodal nonlinearities was analyzed, and a suppression method involving fiber coiling and seed mode characteristic optimization was proposed. Verification experiments were conducted with 20/400, 25/400, and 30/600 fiber-based NSM-CWHPFLs. The results demonstrate the accuracy of the theoretical model, clarify the physical mechanisms of nonlinear spectral sidebands, and demonstrate the comprehensive optimization of intermodal-nonlinearity-induced spectral distortion and mode degradation.

Details

ISSN :
10944087
Volume :
31
Database :
OpenAIRE
Journal :
Optics Express
Accession number :
edsair.doi...........44c65ea42e394ae22f8339f683848475
Full Text :
https://doi.org/10.1364/oe.485582