Mode decomposition of output beams in LD-pumped graded-index fiber Raman lasers

被引：0

作者：

Kharenko, Denis S. ^{[1
,2
]}

Gervaziev, Mikhail D. ^{[1
,2
]}

Kuznetsov, Alexey G. ^{[1
]}

Wabnitz, Stefan ^{[2
,3
]}

Podivilov, Evgeniy, V ^{[1
,2
]}

Babin, Sergey A. ^{[1
,2
]}

机构：

[1] Inst Automat & Electrometry SB RAS, 1 Ac Koptyug Ave, Novosibirsk, Russia

[2] Novosibirsk State Univ, 1 Pirogova Str, Novosibirsk, Russia

[3] Sapienza Univ Rome, DIET, Via Eudossiana 18, I-00184 Rome, Italy

来源：

ADVANCED LASERS, HIGH-POWER LASERS, AND APPLICATIONS XII | 2021年 / 11890卷

基金：

俄罗斯基础研究基金会; 俄罗斯科学基金会;

关键词：

fiber lasers; Raman lasers; graded-index fiber; multimode lasers; mode decomposition; digital holography; spatial light modulator; beam characterization;

D O I：

10.1117/12.2601512

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

All-fiber Raman lasers have demonstrated their potential for the efficient conversion of highly multimode pump beams into a high-quality Stokes beams. However, the modal content of these beams has not been investigated yet. Here we apply, for the first time, a mode decomposition technique for revealing intermodal interactions in different operational regimes of CW multimode Raman lasers. Our approach allows for analyzing the output laser radiation in terms of the amplitude and phase distributions of a huge number of excited modes for both the pump and the Stokes beams, which enables a new insight into nonlinear mode coupling processes. The measured contribution of the first three modes of the residual pump beam after overcoming the SRS threshold decreased on average by 25%, whereas the signal beam mainly consists of fundamental mode (40%) and the modes of the first group (20%).

引用

页数：6

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