On-Chip Dual-Comb Source Based on Terahertz Quantum Cascade Lasers Under Microwave Double Injection

作者：Ziping Li, Wenjian Wan, Kang Zhou, Xiaoyu Liao, Sijia Yang, Zhanglong Fu, Juncheng Cao, Hua Li · 发表于：Physical Review Applied · 年份：2019 · DOI：10.1103/physrevapplied.12.044068 · 被引用次数：32 · 研究领域：Spectroscopy and Laser Applications、Advanced Fiber Laser Technologies、Terahertz technology and applications

High-power broadband terahertz dual-comb sources are of great importance for fast high-resolution spectroscopy, but are rare because of the lack of high-performance terahertz radiation sources. Here the authors demonstrate a broadband terahertz dual-comb source on a chip, based on electrically pumped quantum cascade lasers and microwave double injection. By injection locking the two lasers at slightly different round-trip frequencies, even weak microwave power can significantly broaden the dual-comb bandwidth. Furthermore, the double-injection technique allows direct evaluation of the carrier offset noise of the terahertz laser combs.