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arXiv · 2106.00060

Self-injection locking of the gain-switched laser diode

Artem E. Shitikov·Valery E. Lobanov·Nikita M. Kondratiev·Andrey S. Voloshin·Evgeny A. Lonshakov·Igor A. Bilenko
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Abstract

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 spacing in a wide range from 10 kHz up to 10 GHz. The characteristics of the generated combs were studied for various modulation parameters - modulation frequency and amplitude, and for parameters, defining the efficiency of the self-injection locking - locking phase, coupling efficiency, pump frequency detuning.

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Artem E. Shitikov, Valery E. Lobanov, Nikita M. Kondratiev, Andrey S. Voloshin, Evgeny A. Lonshakov, Igor A. Bilenko. 2021-10-13. Self-injection locking of the gain-switched laser diode. https://doi.org/10.1103/physrevapplied.15.064066

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