A New Approach to Cascaded Stimulated Brillouin Scattering

TL;DR

This paper introduces a simplified theoretical model for cascaded stimulated Brillouin scattering and frequency comb generation, reducing complex interactions to a manageable set of equations, and validates it against experimental data.

Contribution

A novel single-wave model for cascaded stimulated Brillouin scattering that simplifies analysis and accurately predicts experimental results.

Findings

The model accurately describes frequency comb generation.

It reduces the complexity from hundreds to three differential equations.

Excellent agreement with published experimental data.

Abstract

We present a novel approach to cascaded stimulated Brillouin scattering and frequency comb generation in which the multitude of interacting pump, Stokes, and anti-Stokes optical fields are described by a single forward wave and a single backward wave at a single carrier frequency. The envelopes of these two waves are modulated through coupling to a single acoustic oscillation and through four-wave mixing. Starting from a single pump field, we observe the emergence of a comb of frequencies as the intensity is increased. The set of three differential equations derived here are sufficient to describe the generation of any number of Brillouin sidebands in oscillator systems that would have required hundreds of coupled equations in the standard approach. We test the new approach on some published experiments and find excellent agreement with the results.