当前位置: X-MOL 学术Appl. Phys. Lett. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Properties of self-mixing interference in terahertz distributed feedback quantum cascade lasers
Applied Physics Letters ( IF 4 ) Pub Date : 2019-12-23 , DOI: 10.1063/1.5130447
Lei Ge 1 , Ning Yang 1 , Jian Wang 2 , Yuanyuan Li 1 , Weidong Chu 1 , Suqing Duan 1 , Yan Xie 3
Affiliation  

The properties of self-mixing interference in terahertz distributed feedback quantum cascade lasers (THz DFB-QCLs) were studied by coupled wave theory and the multimode rate equation method. Under weak self-mixing optical feedback, the response behaviors of the DFB-QCLs are similar to those of Fabry–Perot lasers and can be described by the Lang–Kobayashi equations with a modified feedback parameter. The amplitudes of the self-mixing power and frequency signals decrease with the increasing DFB coupling factor. Under strong feedback, new side modes arise, which broaden the laser linewidth. The number of side modes decreases with the increasing DFB coupling factor. The simulation also demonstrates that the maximum power mode of a THz DFB-QCL under strong self-mixing feedback is the minimum linewidth mode. These results support the development of self-mixing interferometers based on DFB-QCLs.The properties of self-mixing interference in terahertz distributed feedback quantum cascade lasers (THz DFB-QCLs) were studied by coupled wave theory and the multimode rate equation method. Under weak self-mixing optical feedback, the response behaviors of the DFB-QCLs are similar to those of Fabry–Perot lasers and can be described by the Lang–Kobayashi equations with a modified feedback parameter. The amplitudes of the self-mixing power and frequency signals decrease with the increasing DFB coupling factor. Under strong feedback, new side modes arise, which broaden the laser linewidth. The number of side modes decreases with the increasing DFB coupling factor. The simulation also demonstrates that the maximum power mode of a THz DFB-QCL under strong self-mixing feedback is the minimum linewidth mode. These results support the development of self-mixing interferometers based on DFB-QCLs.

中文翻译:

太赫兹分布反馈量子级联激光器自混合干涉特性

采用耦合波理论和多模速率方程方法研究了太赫兹分布反馈量子级联激光器(THz DFB-QCLs)中自混合干涉的特性。在弱自混合光反馈下,DFB-QCL 的响应行为与 Fabry-Perot 激光器的响应行为相似,并且可以通过带有修改反馈参数的 Lang-Kobayashi 方程来描述。自混合功率和频率信号的幅度随着 DFB 耦合因子的增加而减小。在强反馈下,新的边模出现,从而拓宽了激光线宽。边模的数量随着 DFB 耦合系数的增加而减少。仿真还表明,在强自混频反馈下,THz DFB-QCL 的最大功率模式是最小线宽模式。这些结果支持了基于DFB-QCL的自混合干涉仪的发展。利用耦合波理论和多模速率方程方法研究了太赫兹分布式反馈量子级联激光器(THz DFB-QCL)中自混合干涉的特性。在弱自混合光反馈下,DFB-QCL 的响应行为与 Fabry-Perot 激光器的响应行为相似,并且可以通过带有修改反馈参数的 Lang-Kobayashi 方程来描述。自混合功率和频率信号的幅度随着 DFB 耦合因子的增加而减小。在强反馈下,会出现新的边模,从而拓宽了激光线宽。边模的数量随着 DFB 耦合系数的增加而减少。仿真还表明,在强自混频反馈下,THz DFB-QCL 的最大功率模式是最小线宽模式。这些结果支持基于 DFB-QCL 的自混合干涉仪的开发。
更新日期:2019-12-23
down
wechat
bug