Self-injection locking of the gain-switched laser diode

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.

Physical Review Applied

References in corpus (4)

• Microresonator Soliton Dual-Comb Spectroscopy
• Optimization of laser stabilization via self-injection locking to WGM microresonator
• Compact Stabilized Semiconductor Laser for Frequency Metrology
• Numerical study of solitonic pulse generation in the self-injection locking regime at normal and anomalous group velocity dispersion

Cited by in corpus (2)

• Recent Advances in Laser Self-Injection Locking to High-$Q$ Microresonators
• Ultra high-Q WGM microspheres from ZBLAN for the mid-IR band