Impact of stimulated Raman scattering on dark soliton generation in a silica microresonator

Gwangho Choi, Judith Su

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Generating a coherent optical frequency comb at an arbitrary wavelength is important for fields such as precision spectroscopy and optical communications. Dark solitons which are coherent states of optical frequency combs in normal dispersion microresonators can extend the operating wavelength range of these combs. While the existence and dynamics of dark solitons has been examined extensively, requirements for the modal interaction for accessing the soliton state in the presence of a strong Raman interaction at near visible wavelengths has been less explored. Here, analysis on the parametric and Raman gain in a silica microresonator is performed, revealing that four-wave mixing parametric gain which can be created by a modal-interaction-aided additional frequency shift is able to exceed the Raman gain. The existence range of the dark soliton is analyzed as a function of pump power and detuning for given modal coupling conditions. We anticipate these results will benefit fields requiring optical frequency combs with high efficiency and selectable wavelength such as biosensing applications using silica microcavities that have a strong Raman gain in the normal dispersion regime.

Original languageEnglish (US)
Article number014001
JournalJPhys Photonics
Volume5
Issue number1
DOIs
StatePublished - Jan 1 2023

Keywords

  • avoided mode crossing
  • dark soliton
  • nonlinear optics
  • normal dispersion
  • optical frequency comb
  • stimulated Raman scattering
  • whispering-gallery-mode resonator

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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