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Farey Tree Locking of Terahertz Semiconductor Laser Frequency Combs by Liu, Guibin; Ma, Xuhong; Zhou, Kang; Liu, Binbin; Zheng, Lulu; Bi, Xianglong; Wu, Shumin; Lu, Yanming; Li, Ziping; Wan, Wenjian; Zhang, Zhenzhen; Peng, Junsong; Zhang, Ya; Zeng, Heping; Li, Hua is a scholarly article available to read on EtoBox.

What is Farey Tree Locking of Terahertz Semiconductor Laser Frequency Combs about?

Frequency combs show various applications in molecular fingerprinting, imaging, communications, and so on. In the terahertz frequency range, semiconductor-based quantum cascade lasers (QCLs) are ideal platforms for realizing the frequency comb operation. Although self-started frequency comb operation can be obtained in free-running terahertz QCLs due to the four-wave mixing locking effects, resonant/off-resonant microwave injection, phase locking, and femtosecond laser based locking techniques have been widely used to broaden and stabilize terahertz QCL combs. These active locking methods indeed show significant effects on the frequency stabilization of terahertz QCL combs, but they simultaneously have drawbacks, such as introducing large phase noise and requiring complex optical coupling and/or electrical circuits. Here, we demonstrate Farey tree locking of terahertz QCL frequency combs under microwave injection. The frequency competition between the Farey fraction frequency and the cavity round-trip frequency results in the frequency locking of terahertz QCL combs, and the Farey fraction frequencies can be accurately anticipated based on the downward trend of the Farey tree hiera

Author

Liu, Guibin; Ma, Xuhong; Zhou, Kang; Liu, Binbin; Zheng, Lulu; Bi, Xianglong; Wu, Shumin; Lu, Yanming; Li, Ziping; Wan, Wenjian; Zhang, Zhenzhen; Peng, Junsong; Zhang, Ya; Zeng, Heping; Li, Hua

Published

2024

Language

EN