All-ber Raman lasers have demonstrated their potential for the ecient 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 rst time, a mode decomposition technique for revealing intermodal interactions in dierent 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 rst 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 rst group (20%).

Mode decomposition of output beams in LD-pumped graded-index fiber Raman lasers / Kharenko, Denis S.; Gervaziev, Mikhail D.; Kuznetsov, Alexey; Wabnitz, Stefan; Podivilov, Evgeniy V.; Babin, Sergey A.. - 11890:(2021), pp. 1-7. (Intervento presentato al convegno SPIE/COS Photonics Asia, 2021 tenutosi a Nantong; China) [10.1117/12.2601512].

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

Wabnitz, Stefan;
2021

Abstract

All-ber Raman lasers have demonstrated their potential for the ecient 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 rst time, a mode decomposition technique for revealing intermodal interactions in dierent 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 rst 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 rst group (20%).
2021
SPIE/COS Photonics Asia, 2021
optical fibers; nonlinear optics; optical solitons; Kerr effect; four wave mixing; Raman scattering; fiber lasers
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
Mode decomposition of output beams in LD-pumped graded-index fiber Raman lasers / Kharenko, Denis S.; Gervaziev, Mikhail D.; Kuznetsov, Alexey; Wabnitz, Stefan; Podivilov, Evgeniy V.; Babin, Sergey A.. - 11890:(2021), pp. 1-7. (Intervento presentato al convegno SPIE/COS Photonics Asia, 2021 tenutosi a Nantong; China) [10.1117/12.2601512].
File allegati a questo prodotto
File Dimensione Formato  
Kharenko_Mode-decomposition_2021.pdf

solo gestori archivio

Tipologia: Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 438.67 kB
Formato Adobe PDF
438.67 kB Adobe PDF   Contatta l'autore

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1580258
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 1
  • ???jsp.display-item.citation.isi??? 0
social impact