Analysis of Operating Regimes of Terahertz Quantum Cascade Laser Frequency Combs
Analysis of Operating Regimes of Terahertz Quantum Cascade Laser Frequency Combs
复制标题
DOI：
10.1109/tthz.2017.2693822
复制
发表时间：
2017-07-01
影响因子：
3.2
通讯作者：
Jirauschek, Christian
中科院分区：
文献类型：
--
作者：
Tzenov, Petar;Burghoff, David;Jirauschek, Christian
近年来，量子级联激光器（QCL）已经显示出在电磁频谱的中红外和太赫兹部分产生频率梳的巨大潜力。研究界在QCL器件的理论理解和实验实现方面都取得了成功，能够产生稳定的宽带频率梳。指出四波混频（FWM）是梳状结构的主要形成过程，群速度色散（GVD）是梳状结构退化的主要机制。因此，采用了特殊的色散补偿技术，以抑制后者，同时增强前者的过程。在这里，我们进行了详细的计算分析的FWM，GVD，和空间烧孔（SHB），所有已知的QCL中发挥作用，并显示SHB有相当大的影响，该设备是否将作为一个梳或不。因此，我们得出结论，为了成功实现量子级联激光频率梳，也需要解决这种效应。
In recent years, quantum cascade lasers (QCLs) have shown tremendous potential for the generation of frequency combs in the mid- infrared and terahertz portions of the electromagnetic spectrum. The research community has experienced success both in the theoretical understanding and experimental realization of QCL devices, capable of generating stable and broadband frequency combs. Specifically, it has been pointed out that four wave mixing (FWM) is the main comb formation process and group velocity dispersion (GVD) is the main comb-degradation mechanism. As a consequence, special dispersion compensation techniques have been employed, in order to suppress the latter and simultaneously enhance the former processes. Here, we perform a detailed computational analysis of FWM, GVD, and spatial hole burning (SHB), all known to play a role in QCLs, and show that SHB has a considerable impact on whether the device will operate as a comb or not. We therefore conclude that for a successful implementation of a quantum cascade laser frequency comb, one would need to address this effect as well.