Self-Injection Locking of a Gain-Switched Laser Diode

  title={Self-Injection Locking of a Gain-Switched Laser Diode},
  author={Artem E. Shitikov and Valery E. Lobanov and Nikita M. Kondratiev and Andrey S. Voloshin and Evgeny A. Lonshakov and Igor A Bilenko},
  journal={Physical Review Applied},
We experimentally observed self-injection locking regime of the gain-switched laser to high-Q optical microresonator. We revealed that comb generated by the gain-switched laser experiences a dramatic reduce of comb teeth linewidths in this regime. We demonstrated the Lorentzian linewidth of the comb teeth of sub-kHz scale as narrow as for non-switched self-injection locked laser. Such setup allows generation of high-contrast electrically-tunable optical frequency combs with tunable comb line… 
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