Zhang Luan, Chan Sze-Chun
Opt Lett. 2022 Sep 1;47(17):4483-4486. doi: 10.1364/OL.469061.
Period-one (P1) dynamics of two lasers under a common injection are perturbed for externally locked frequency-modulated continuous-wave (FMCW) generation. The first laser is injected into P1 dynamics at frequency , where the dynamics is perturbed by a slow modulation to induce adiabatic sweeping for FMCW generation and a fast modulation to seed the whole comb for external locking. The second laser is injected into a faster P1 dynamics at 3 that is perturbed for harmonic locking. The central frequency is boosted to 4 by coherently combining the lasers. FMCW generation with external locking is demonstrated with a sweep range of 6 GHz, comb contrast enhanced to 42 dB, and 4 reaching 80 GHz. Inherent competition between external locking and frequency modulation is revealed, although an optimal strength is identified for locking the whole comb. Wide tuning of the central frequency is also supported.
在共同注入条件下，对两台激光器的一阶（P1）动力学进行扰动，以实现外部锁定的调频连续波（FMCW）产生。第一台激光器以频率 注入到P1动力学中，在该动力学中，通过缓慢调制来扰动动力学，以诱导用于FMCW产生的绝热扫描，并通过快速调制为外部锁定来为整个梳状谱提供种子。第二台激光器以3 注入到更快的P1动力学中，该动力学被扰动以实现谐波锁定。通过相干组合激光器，中心频率提升至4 。展示了具有6 GHz扫描范围、梳状谱对比度增强至42 dB且4 达到80 GHz的外部锁定FMCW产生。揭示了外部锁定与频率调制之间的固有竞争，尽管确定了用于锁定整个梳状谱的最佳强度。还支持中心频率的宽调谐。
