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• Journal of Infrared and Millimeter Waves
• Vol. 40, Issue 6, 865 (2021)
Yu YANG1, Shuai ZHAO1, Yuan SHEN1, Ling-Jun MENG1, Meng-Yu WANG2, Lei ZHANG1, and Ke-Yi WANG1、*
Author Affiliations
• 1Department of Precision Machinery and Precision Instrumentation，University of Science and Technology of China，Hefei 230026，China
• 2Key Laboratory of Nondestructive Test of Ministry of Education，Nanchang Hang-kong University，Nanchang 330063，China
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Yu YANG, Shuai ZHAO, Yuan SHEN, Ling-Jun MENG, Meng-Yu WANG, Lei ZHANG, Ke-Yi WANG. Generation of stimulated Brillouin scattering in a packaged CaF2 micro-disk resonator with ultra-high-Q factor[J]. Journal of Infrared and Millimeter Waves, 2021, 40(6): 865 Copy Citation Text show less

Abstract

The whispering gallery mode (WGM) micro-resonator is an ideal platform for investigating the nonlinear light phenomenon. In this article, we achieved up to the fifth-order cascaded stimulated Brillouin scattering (SBS) light in a CaF2 micro-disk resonator with an mm-sized 12.6 mm diameter and an ultra-high quality factor ($Q$ factor) $1.16×108$ at 1 550 nm wavelength. We found that there are multi modes of families in our large-scale micro-disk resonator when coupled to an adiabatic tapered fiber, which can easily select resonances matching the SBS frequency shift. This can eliminate the requirement that precisely controlls the scale of the resonator to match the free spectral range (FSR) with the Brillouin frequency shift. During our experiment, to solve the environmental fluctuation problem between the micro-disk resonator and tapered fiber, we designed a packaged platform that can steadily seal the resonator and tapered fiber in an N2 atmosphere. The generated cascaded Brillouin light and the stable packaged platform can further be used to investigate the multi-wavelength Brillouin laser and Brillouin light-based gyroscope.

Introduction

The whispering gallery mode （WGM）resonator can confine the light in a cavity by total internal reflections around its inner surface，which can enhance the light power intensity in a very small mode volume and store the energy for a long time，in another word it means high $Q$ factor or ultra-high $Q$ factor can be provided1-4. Such resonators have attracted great attention for decades，due to it provides an ideal platform to investigate linear applications or nonlinear effects between light and matter，such as resonator sensing applications，cavity optomechanical research，light storage，and cavity quantum dot investigation5-8.

Yu YANG, Shuai ZHAO, Yuan SHEN, Ling-Jun MENG, Meng-Yu WANG, Lei ZHANG, Ke-Yi WANG. Generation of stimulated Brillouin scattering in a packaged CaF2 micro-disk resonator with ultra-high-Q factor[J]. Journal of Infrared and Millimeter Waves, 2021, 40(6): 865