摘要
回音壁模式微腔具有高品质因子、小模式体积、低非线性阈值特性,与自注入锁定技术相结合可以实现激光稳频与线宽压缩,因此在激光陀螺、激光测距、相干光通信等领域具有潜在的应用价值。随着回音壁模式微腔制作工艺的不断突破,实现高集成度、稳定、低噪声、宽波长覆盖范围的光源成为研究热点。综述了基于回音壁模式微腔的激光自注入锁定技术近年来的研究进展。首先,详细介绍了回音壁模式微腔的关键参数,包括谐振波长、自由光谱范围、品质因子和模式体积;其次,分析了基于回音壁模式微腔的激光自注入锁定技术的机理,并综述了其在窄线宽激光器中的应用;随后,分析了回音壁模式微腔的非线性特性,并且介绍了由四波混频效应引起的光频梳的特性;同时,以片上集成的回音壁模式微腔为主要研究对象,阐述了自注入锁定光频梳的研究进展;最后对回音壁模式微腔在激光技术领域中的发展趋势进行了展望。
Significance A whispering gallery mode resonator(WGMR)is an optical device that can confine light in both spatial and temporal dimensions with total reflection.Owing to its high-Q and small mode-volume characteristics,a WGMR is a powerful and reliable platform for various photonic applications such as microlasers,optomechanics,biosensing,laser stabilization,and nonlinear optics.The WGMR-based self-injection locking technology uses resonant backscattering inside the resonator to purify the spectrum,which significantly reduces the laser linewidth and has been extensively used for laser stabilization.Because no electronic feedback control is required in this scheme and a WGMR can achieve a Q-factor of over 109 with a micron-scale,the technique can achieve a sub-hertz linewidth with a compact size.In addition,the WGMR with a wide transparency window can be integrated with lasers operating in various wavelength bands to achieve narrow-linewidth lasing.In a high-Q WGMR,the photon's lifespan can be prolonged from nanoseconds to microseconds,which improves light--matter interaction,making WGMRs well-suited for the acquisition of ultralow-threshold nonlinear optical effects.Numerous nonlinear effects,including second-harmonic generation,four-wave mixing(FWM),stimulated Raman scattering,and stimulated Brillouin scattering,have been theoretically investigated and experimentally demonstrated in WGMRs.In particular,optical frequency combs(OFCs),namely microcombs,based on four-wave mixing in a WGMR have attracted substantial attention and have been generated in many integrated phonic platforms.However,the conventional generation of microcomb requires narrow-linewidth pumps,which is challenging for on-chip integration.The WGMR-based self-injection locking is a viable alternative scheme for integrated microcomb.The study introduces important parameters of WGMRs,followed by the recent research progress on self-injection locked laser based on the WGMR,nonlinear optical effects,and high-level integration of microcombs using self-in
作者
余霞
陈旭
刘静敏
罗家豪
Yu Xia;Chen Xu;Liu Jingmin;Luo Jiahao(School of Instrumentation Science and Opto-Electronics Engineering,Beihang University,Beijing 100191,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2022年第19期56-69,共14页
Chinese Journal of Lasers
基金
国家自然科学基金(62175007)。
关键词
非线性光学
微腔
激光技术
激光注入锁定
四波混频
nonlinear optics
microcavities
laser technique
laser injection locking
four-wave mixing
