@inproceedings{33c55178173647b1bdfbbe2ff70c4548,
title = "Mode decomposition of output beams in LD-pumped graded-index fiber Raman lasers",
abstract = "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%). ",
keywords = "Beam characterization, Digital holography, Fiber lasers, Graded-index fiber, Mode decomposition, Multimode lasers, Raman lasers, Spatial light modulator",
author = "Kharenko, {Denis S.} and Gervaziev, {Mikhail D.} and Kuznetsov, {Alexey G.} and Stefan Wabnitz and Podivilov, {Evgeniy V.} and Babin, {Sergey A.}",
note = "Funding Information: The study was supported by the Russian Foundation for Basic Research (Grant No. 21-42-00019). Publisher Copyright: {\textcopyright} 2021 SPIE.; Advanced Lasers, High-Power Lasers, and Applications XII 2021 ; Conference date: 10-10-2021 Through 12-10-2021",
year = "2021",
doi = "10.1117/12.2601512",
language = "English",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Shibin Jiang and Ingmar Hartl and Jun Liu",
booktitle = "Advanced Lasers, High-Power Lasers, and Applications XII",
address = "United States",
}