Research on microcavity self-injection locking narrow line width technology based on WGM
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.
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