A two-level model of rise time in quantum cascade laser materials applied to 5 micron, 9 micron and terahertz-range wavelengths

2014 International Conference on Manufacturing, Optimization, Industrial and Material Engineering

Webb, J.F.^1 ; Yong, K.S.C.^2 ; Haldar, M.K.^2

Department of Mechanical, Materials and Manufacturing Engineering, University of Nottingham Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor Darul Ehasn, Malaysia^1

Faculty of Engineering, Computing and Science, Swinburne University of Technology, Sarawak Campus, Jalan Simpang Tiga, 93350 Kuching, Sarawak, Malaysia^2

关键词: Large signal response;    Rate-equation models;    Risetimes;    Small-signal response;    Terahertz range;    Terahertz sources;    Turn-on-delay;    Two-level models;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/58/1/012024/pdf
DOI  :  10.1088/1757-899X/58/1/012024

来源: IOP

【 摘 要 】

An equivalent circuit simulation of a two-level rate equation model for quantum cascade laser (QCL) materials is used to study the turn on delay and rise time for three QCLs with 5 micron, 9 micron and terahertz-range wavelengths. In order to do this it is necessary that the model can deal with large signal responses and not be restricted to small signal responses; the model used here is capable of this. The effect of varying some of the characteristic times in the model is also investigated. The comparison of the terahertz wave QCL with the others is particularly important given the increased interest in terahertz sources which have a large range of important applications, such as in medical imaging.