Shitikov Artem E, Lykov Ilya I, Benderov Oleg V, Chermoshentsev Dmitry A, Gorelov Ilya K, Danilin Andrey N, Galiev Ramzil R, Kondratiev Nikita M, Cordette Steevy J, Rodin Alexander V, Masalov Anatoly V, Lobanov Valery E, Bilenko Igor A
Opt Express. 2023 Jan 2;31(1):313-327. doi: 10.1364/OE.478009.
Self-injection locking of a diode laser to a high-quality-factor microresonator is widely used for frequency stabilization and linewidth narrowing. We constructed several microresonator-based laser sources with measured instantaneous linewidths of 1 Hz and used them for investigation and implementation of the self-injection locking effect. We studied analytically and experimentally the dependence of the stabilization coefficient on tunable parameters such as locking phase and coupling rate. It was shown that precise control of the locking phase allows fine-tuning of the generated frequency from the stabilized laser diode. We also showed that it is possible for such laser sources to realize fast continuous and linear frequency modulation by injection current tuning inside the self-injection locking regime. We conceptually demonstrate coherent frequency-modulated continuous wave LIDAR over a distance of 10 km using such a microresonator-stabilized laser diode in the frequency-chirping regime and measure velocities as low as sub-micrometer per second in the unmodulated case. These results could be of interest to cutting-edge technology applications such as space debris monitoring and long-range object classification, high-resolution spectroscopy, and others.
二极管激光器自注入锁定到高品质因数微谐振器被广泛用于频率稳定和线宽变窄。我们构建了几个基于微谐振器的激光源，测量得到的瞬时线宽为1 Hz，并将它们用于自注入锁定效应的研究和实现。我们通过分析和实验研究了稳定系数对诸如锁定相位和耦合率等可调参数的依赖性。结果表明，精确控制锁定相位可以对稳定激光二极管产生的频率进行微调。我们还表明，在自注入锁定范围内，通过注入电流调谐，此类激光源有可能实现快速连续和线性频率调制。我们从概念上演示了在频率啁啾模式下使用这种微谐振器稳定的激光二极管进行10公里距离的相干调频连续波激光雷达，并在未调制情况下测量到低至亚微米每秒的速度。这些结果可能对诸如空间碎片监测和远程目标分类、高分辨率光谱学等前沿技术应用具有重要意义。
