Time-Resolved Thermal Quenching of THz Quantum Cascade Lasers

被引：20
|
作者：
Fathololoumi, Saeed [1 ,2 ]
Dupont, Emmanuel [1 ]
Ban, Dayan [2 ]
Graf, Marcel [1 ,2 ]
Laframboise, Sylvain R. [1 ]
Wasilewski, Zbig R. [1 ]
Liu, H. C. [1 ]
机构：
[1] CNR, Inst Microstruct Sci, Ottawa, ON K1A 0R6, Canada
[2] Univ Waterloo, Dept Elect & Comp Engn, Waterloo, ON N2L 3G1, Canada
来源：
IEEE JOURNAL OF QUANTUM ELECTRONICS | 2010年 / 46卷 / 03期
基金：
加拿大自然科学与工程研究理事会;
关键词：
Thermal dynamics; THz quantum cascade laser; THz quantum well photodetector; time resolved measurements; HIGH-POWER; TERAHERTZ; MODE;
D O I：
10.1109/JQE.2009.2031250
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The thermal dynamic behaviors of terahertz quantum cascade lasers are investigated using a spectrally matching terahertz quantum-well photodetector. The THz output power of a lasing device under a pulse excitation is found to decrease with time, which is attributed to the increase of active-region temperature. The measurements show that the duration of output lasing pulse ranges from a few microseconds up to 77 mu s, depending on device bias and heat-sink temperature. Atheoretical analysis based on a two-dimensional heat diffusion model is presented. The model calculates lasing quenching time based on an "average active-region temperature" criterion as well as a "reserve of gain" criterion. The best fit for quenching time is found when the vertical thermal conductivity in the quantum well region is two orders of magnitude lower than that of substrate. The measured lasing quenching time is in very good agreement with theoretical modeling calculated using both criteria.
引用
收藏
页码：396 / 404
页数：9
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