4.7 Article

Nonlinear dynamics of four-wave mixing, cascaded stimulated Raman scattering and self Q-switching in a common-cavity ytterbium/Raman random fiber laser

Journal

OPTICS AND LASER TECHNOLOGY
Volume 134, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.optiastec.2020.106613

Keywords

Random distributed feedback fiber laser; Nonlinear optics; Stimulated Raman Scattering; Random laser

Funding

  1. National Natural Science Foundation of China(NSFC) [61635005, 62075030]
  2. Sichuan Provincial Project for Outstanding Young Science and Technology Scholars [2020JDJQ0024]
  3. 111 project [B14039]
  4. Ministry of Science, Technology and Innovation [400011/2016-6]
  5. Brazilian agency CNPq
  6. Brazilian agency CAPES
  7. Brazilian agency FACEPE
  8. Brazilian agency INCT of Photonics program

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This study reports for the first time significant wavelength down-conversion caused by FWM in a Ytterbium/Raman random fiber laser, as well as the simultaneous observation of nonlinear optical dynamics of SRS, FWM, and self-pulsation. The experimental results agree well with theoretical calculations for the FWM process, highlighting the importance of these findings for high power Raman-based fiber lasers and random fiber lasers.
The combined effect of stimulated Raman scattering (SRS), four-wave mixing (FWM) and self-pulsation in optical fibers can be either beneficial or detrimental, depending upon a specific application. In this work, we report for the first time that, under watt-level CW pumping in a common-cavity Ytterbium/Raman random fiber laser, a significant wavelength down-conversion is generated by FWM in a standard single-mode fiber; moreover, nonlinear optical dynamics of SRS, FWM and self-pulsation was simultaneously observed in this setup. In a certain range of pump powers, strong and stable self-pulsation effects were observed, which occurred simulta-neously with the cascaded SRS emissions and an intense visible orange emission at 603 nm, which can be attributed to the FWM from the 1064 nm light-wave. The experimental results agree well with the theoretical calculations for the FWM process. Besides, self-pulsation and high order cascaded are also analyzed. The importance of these results for high power Raman based fiber lasers and random fiber lasers, as well as continuum generation will be discussed.

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