Cascaded Brillouin lasing in monolithic barium fluoride whispering gallery mode resonators

Abstract

We report the observation of stimulated Brillouin scattering and lasing at 1550~nm in barium fluoride (BaF${}_2$) crystal. Brillouin lasing was achieved with ultra-high quality ($Q$) factor monolithic whispering gallery mode (WGM) mm-size disk resonators. Overmoded resonators were specifically used to provide cavity resonances for both the pump and all Brillouin Stokes waves. Single and multiple Brillouin Stokes radiations with frequency shift ranging from $8.2$ GHz up to $49$ GHz have been generated through cascaded Brillouin lasing. BaF${}_2$ resonator-based Brillouin lasing can find potential applications for high-coherence lasers and microwave photonics.

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• Perspectives on high-frequency nanomechanics, nanoacoustics, and nanophononics
• Non-Gaussian mechanical motion via single and multi-phonon subtraction from a thermal state
• Brillouin Optomechanics in Coupled Silicon Microcavities
• A New Approach to Cascaded Stimulated Brillouin Scattering
• Whispering gallery mode microresonator for nonlinear optics
• Raman Laser Switching Induced by Cascaded Light Scattering
• Brillouin lasing in coupled silica toroid microcavities
• Relative Intensity Noise in a Multi-Stokes Brillouin Laser