Frequency combs in optically injected terahertz ring quantum cascade lasers
Frequency combs in optically injected terahertz ring quantum cascade lasers
复制标题
DOI：
10.1063/5.0173912
复制
发表时间：
2023-08
期刊：
影响因子：
5.6
通讯作者：
Md Istiak Khan;Zhenyang Xiao;S. Addamane;D. Burghoff
中科院分区：
文献类型：
--
作者：
Md Istiak Khan;Zhenyang Xiao;S. Addamane;D. Burghoff
量子级联激光器（QCL）已经成为产生中红外和太赫兹波长的芯片级频率梳的有前途的候选者。在这项工作中，我们演示了频率梳形成环形太赫兹QCL使用的光注入从分布反馈（DFB）激光器。选择DFB设计频率以匹配环形腔的模式（接近3.3THz），并且来自DFB的光经由总线波导注入环形QCL。通过控制光注入的功率和频率，我们证明了在环形腔中可以选择性地形成和控制梳状结构。数值模拟表明，这种梳主要是频率调制的字符，与注射触发梳形成。我们还表明，该环可以用作滤波器，以控制输出的DFB QCL，潜在的太赫兹光子集成电路的兴趣。我们的工作表明，波导耦合器是一个引人注目的方法注入和提取辐射的环形太赫兹梳，并提供了令人兴奋的可能性，产生新的太赫兹梳状态，如调频波，孤子，等等。
Quantum cascade lasers (QCLs) have emerged as promising candidates for generating chip-scale frequency combs in mid-infrared and terahertz wavelengths. In this work, we demonstrate frequency comb formation in ring terahertz QCLs using the injection of light from a distributed feedback (DFB) laser. The DFB design frequency is chosen to match the modes of the ring cavity (near 3.3 THz), and light from the DFB is injected into the ring QCL via a bus waveguide. By controlling the power and frequency of the optical injection, we show that combs can be selectively formed and controlled in the ring cavity. Numerical modeling suggests that this comb is primarily frequency-modulated in character, with the injection serving to trigger comb formation. We also show that the ring can be used as a filter to control the output of the DFB QCL, potentially being of interest in terahertz photonic integrated circuits. Our work demonstrates that waveguide couplers are a compelling approach for injecting and extracting radiation from ring terahertz combs and offer exciting possibilities for the generation of new comb states in terahertz, such as frequency-modulated waves, solitons, and more.