Cross-polarized stimulated Brillouin scattering empowered photonics

TL;DR

This paper demonstrates innovative photonic devices using cross-polarized stimulated Brillouin scattering in lithium niobate, achieving narrow linewidth lasers, efficient mode conversion, and frequency combs for advanced optical applications.

Contribution

It introduces novel applications of XP-SBS in lithium niobate, including a reconfigurable laser, a mode converter, and a Brillouin-quadratic laser with frequency combs, advancing photonic device capabilities.

Findings

Achieved 0.7-Hz linewidth and 40-nm tunability in a reconfigurable laser.

Realized 55% efficiency in intracavity Brillouin-enhanced mode conversion.

Demonstrated Brillouin-quadratic laser and frequency combs in near-infrared and visible bands.

Abstract

This paper explores the integration of cross-polarized stimulated Brillouin scattering (XP-SBS) with Kerr and quadratic nonlinearities in lithium niobate (LN) to enhance photonic device performance. Three novel applications are demonstrated: (i) a reconfigurable stimulated Brillouin laser (SBL) with 0.7-Hz narrow linewidth and 40-nm tunability, enabled by XP-SBS's thermo-optic phase matching; (ii) an efficient coherent mode converter achieving 55% conversion efficiency via intracavity Brillouin-enhanced four-wave mixing; (iii) a Brillouin-quadratic laser and frequency comb operational in near-infrared and visible bands, benefiting from the interaction between XP-SBS and quadratic nonlinearity. These advancements promise significant improvements in photonic technologies, including narrow-linewidth laser, microcomb generation, and optical signal processing, paving the way for more robust and versatile applications.