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Paper detail

Harmonic mode locking in a high-Q whispering gallery mode microcavity

A numerical and experimental study of the generation of harmonic mode locking in a silica toroid microcavity is presented. We use a generalized mean-field Lugiato-Lefever equation and solve it with the split-step Fourier method. We found that stable harmonic mode locking regime can be accessed when we reduce the input power after strong pumping even when we do not carefully adjust the wavelength detuning. This is due to the bistable nature of the nonlinear cavity system. The experiment agrees well with the numerical analysis, where we obtain low-noise Kerr comb spectrum at low longitudinal mode spacing by gradually reducing the pumping input after strong pumping. This finding clarifies the procedure for generating harmonic mode locking in such high-Q microcavity systems.

preprint2014arXivOpen access
Takumi KatoTomoya KobatakeRyo SuzukiZhelun ChenTakasumi Tanabe
physics.optics
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Takumi KatoTomoya KobatakeRyo SuzukiZhelun ChenTakasumi Tanabe

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