Dual-laser self-injection locking to an integrated microresonator
Abstract
Diode laser self-injection locking (SIL) to a whispering gallery mode of a high quality factor resonator is a widely used method for laser linewidth narrowing and high-frequency noise suppression. SIL has already been used for the demonstration of ultra-low-noise photonic microwave oscillators and soliton microcomb generation and has a wide range of possible applications. Up to date, SIL was demonstrated only with a single laser. However, multi-frequency and narrow-linewidth laser sources are in high demand for modern telecommunication systems, quantum technologies, and microwave photonics. Here we experimentally demonstrate the dual-laser SIL of two multifrequency laser diodes to different modes of an integrated SiN microresonator. Simultaneous spectrum collapse of both lasers, as well as linewidth narrowing and high-frequency noise suppression , as well as strong nonlinear interaction of the two fields with each other, are observed. Locking both lasers to the same mode results in a simultaneous frequency and phase stabilization and coherent addition of their outputs. Additionally, we provide a comprehensive dual-SIL theory and investigate the influence of lasers on each other caused by nonlinear effects in the microresonator.
Cite
@article{arxiv.2201.02130,
title = {Dual-laser self-injection locking to an integrated microresonator},
author = {Dmitry A. Chermoshentsev and Artem E. Shitikov and Evgeny A. Lonshakov and Georgy V. Grechko and Ekaterina A. Sazhina and Nikita M. Kondratiev and Anatoly V. Masalov and Igor A. Bilenko and Alexander I. Lvovsky and Alexander E. Ulanov},
journal= {arXiv preprint arXiv:2201.02130},
year = {2022}
}