TY - JOUR

T1 - Mode-resolved analysis of pump and Stokes beams in LD-pumped GRIN fiber Raman lasers

AU - Kharenko, Denis S.

AU - Gervaziev, Mikhail D.

AU - Kuznetsov, Alexey G.

AU - Podivilov, Evgeniy V.

AU - Wabnitz, Stefan

AU - Babin, Sergey A.

N1 - Funding Information: Acknowledgments. The study was supported by the Russian Science Foundation (Grant No. 21-72-30024, IA&E) and by the Russian Ministry of Science and Education (Grant No. 14.Y26.31.0017, NSU), the work of S.W. was also supported by the European Research Council (grant no. 740355). Funding Information: Funding. Russian Science Foundation (21-72-30024); Ministry of Education and Science of the Russian Federation (14.Y26.31.0017); European Research Council (740355). Publisher Copyright: © 2022 Optica Publishing Group.

PY - 2022/3/1

Y1 - 2022/3/1

N2 - All-fiber Raman lasers have demonstrated their potential for efficient conversion of highly multimode pump beams into high-quality Stokes beams. However, the modal content of these beams has not yet been investigated. In this work, based on a mode decomposition technique, we are able to reveal the details of intermodal interactions in the different operation regimes of continuous wave multimode gradedindex fiber Raman lasers. We observed that, above the laser threshold, the residual pump beam is strongly depleted in its transverse modes with principal quantum number below 10. However, the generated Stokes signal beam mainly consists of the fundamental mode, but higher-order modes are also present, albeit with exponentially decreasing population.

AB - All-fiber Raman lasers have demonstrated their potential for efficient conversion of highly multimode pump beams into high-quality Stokes beams. However, the modal content of these beams has not yet been investigated. In this work, based on a mode decomposition technique, we are able to reveal the details of intermodal interactions in the different operation regimes of continuous wave multimode gradedindex fiber Raman lasers. We observed that, above the laser threshold, the residual pump beam is strongly depleted in its transverse modes with principal quantum number below 10. However, the generated Stokes signal beam mainly consists of the fundamental mode, but higher-order modes are also present, albeit with exponentially decreasing population.

UR - http://www.scopus.com/inward/record.url?scp=85125553244&partnerID=8YFLogxK

U2 - 10.1364/OL.449119

DO - 10.1364/OL.449119

M3 - Article

C2 - 35230332

AN - SCOPUS:85125553244

VL - 47

SP - 1222

EP - 1225

JO - Optics Letters

JF - Optics Letters

SN - 0146-9592

IS - 5

ER -