Cascade Brilloiun scattering on short-lived phonons for frequency comb generation

TL;DR

This paper explores cascade Brillouin scattering involving short-lived phonons, revealing a threshold-driven multi-mode excitation useful for frequency comb generation without requiring anomalous dispersion.

Contribution

It demonstrates that two phonon modes suffice for cascade scattering in this regime, leading to a fundamentally different cascade behavior and enabling uniform frequency combs.

Findings

Cascade scattering involves many optical modes above a pump threshold.

Two phonon modes are sufficient for cascade in the short-lived phonon regime.

Frequency combs with uniform amplitudes can be generated without anomalous dispersion.

Abstract

We consider Brillouin scattering on short-lived phonon modes, such that the relative Brillouin shift between propagating and scattered waves is smaller than the relative width of phonon modes. In this case one phonon mode facilitates scattering between many pairs of optical modes. We show that in this limit two phonon modes are sufficient for cascade Brillouin scattering (one forward propagating wave and one counter propagating wave), and that the cascade behavior is qualitatively different from the cascade in conventional Brillouin systems with distinct phonon modes for each optical mode pair. In particular, our results show that there is a pump threshold above which many optical modes become excited simultaneously, as opposed to a cascade gradually building up. The resulting cascade scattering can be exploited for frequency comb generation with uniform amplitudes and without the need for anomalous dispersion in the medium.