摘要
回音壁模式(whispering gallery mode,WGM)微腔具有超高Q值和极小的模式体积,并且还存在一种弱后向瑞利散射.利用WGM微腔的该反馈机制,可以实现激光线宽几个数量级的压缩,基于此设计了一种窄线宽激光器.利用数值仿真分析了自注入锁定过程中的光学行为,具体而言分析了系统中相位、失谐、后向散射、耦合效率的变化对系统性能的影响.同时并使用半导体激光器进行了验证实验,半导体激光器中心波长为1552.126 nm,实验中将7 MHz线宽激光输出压窄至500 kHz.基于该方案实现的窄线宽激光器具有轻量化、便捷性高、性能稳定等诸多优点.因而,这种窄线宽激光器在激光干涉测量、激光陀螺、激光测距等领域具有潜在的应用价值.
Abstract
Whispering Gallery Mode(WGM)microcavities exhibit ultrahigh Q factors and extremely small mode vol-umes,along with weak backward Rayleigh scattering.By utilizing this feedback mechanism in WGM microcavities,a laser linewidth compression by several orders of magnitude can be achieved,based on which a narrow linewidth laser is designed.Numerical simulations were used to analyze the optical behavior during the self-injection locking process,specifically the effects of changes in phase,detuning,backscattering and coupling efficiency on the system performance.Additionally,experimental validation is performed using a semiconductor laser with a central wavelength of 1552.126nm,and the 7 MHz linewidth laser output was narrowed to 500 kHz in the experiments.The narrow line-width laser achieved through this approach has many advantages such as lightweight,high convenience,and stable per-formance.As a result,this narrow linewidth laser holds potential applications in areas such as laser interferometry,la-ser gyroscopes,laser ranging,and other related fields.
维普
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