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Related Experiment Video

Updated: Jun 17, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Published on: November 30, 2012

All-optical tunable pulse frequency chirp via slow light.

Gil Fanjoux1, Thibaut Sylvestre

  • 1Institut FEMTO-ST, Département d'Optique P. M. Duffieux, Université de Franche-Comté,CNRS UMR 6174, Besançon, France. gil.fanjoux@univ-fcomte.fr

Optics Letters
|December 18, 2009
PubMed
Summary

We theoretically explore slow light in the picosecond regime using stimulated Raman scattering. This study shows that Raman slow light can tune frequency chirp, a novel implication arising from altered group and phase velocities.

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Area of Science:

  • Nonlinear Optics
  • Quantum Optics
  • Photonics

Background:

  • Stimulated Raman scattering (SRS) is a key nonlinear optical process.
  • Investigating slow light in the picosecond regime requires accounting for chromatic dispersion and cross-phase modulation.
  • Understanding pulse dynamics in slow-light media is crucial for optical signal processing.

Purpose of the Study:

  • To theoretically investigate slow light generation via SRS in the picosecond regime.
  • To analyze the interplay of chromatic dispersion and cross-phase modulation in SRS slow light.
  • To demonstrate the all-optical tuning of frequency chirp using Raman slow light.

Main Methods:

  • Theoretical modeling of stimulated Raman scattering.
  • Analysis of pulse propagation in nonlinear optical media.

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  • Investigation of group and phase velocity effects in slow-light conditions.

    • Main Results:

    • Slow light via SRS is investigated in the picosecond regime.
    • Raman pulse walk-off is controlled.
    • Cross-phase-modulation-induced frequency chirp is shown to be all-optically tunable via Raman slow light.
    • This tuning is attributed to group velocity being more affected than phase velocity in slow-light media.

    Conclusions:

    • Raman slow light offers a novel method for all-optical tuning of frequency chirp.
    • The distinct effects on group and phase velocities are key to this phenomenon.
    • Findings have implications for advanced optical signal processing and light manipulation.