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Area of Science:

  • Nonlinear optics
  • Laser science
  • Spectroscopy

Background:

  • Stimulated Raman scattering (SRS) in gas mixtures typically shows reduced gain with buffer gases due to increased phase mismatch and collisions.
  • Previous studies indicate buffer gases favor lower-order Stokes lines and decrease overall Raman gain.

Purpose of the Study:

  • To investigate the effect of precisely controlled dispersion from buffer gases on Raman gain in gas-filled hollow-core photonic crystal fibers (HC-PCFs).
  • To explore the potential for enhanced Raman gain and efficient sideband generation using buffer gases in HC-PCFs.

Main Methods:

  • Utilizing gas-filled HC-PCFs with controlled buffer gas mixtures.
  • Investigating nonlinear coupling between interacting fields under varying gas pressures.
  • Measuring stimulated Raman scattering, including Stokes and anti-Stokes sidebands, and modal purity.

Main Results:

  • Demonstrated significant enhancement of effective Raman gain when a buffer gas is added, contrary to previous reports.
  • Achieved efficient conversion to higher-order Stokes and anti-Stokes sidebands with high modal purity.
  • Reported up to 5% visible and 2% ultraviolet anti-Stokes conversion efficiencies at reduced total gas pressures.

Conclusions:

  • Precisely controlled dispersion from buffer gases can beneficially enhance Raman gain in HC-PCFs.
  • This approach enables efficient nonlinear optical processes at lower pressures, suppressing competing effects like Raman backscattering.
  • The developed gas-based waveguide devices offer tunable nonlinear optical responses and potential applications in laser science and spectroscopy.