Temperature dependence of the key electro-optical characteristics for midinfrared emitting quantum cascade lasers

被引：74

作者：

Botez, D. ^{[1
]}

Kumar, S. ^{[2
]}

Shin, J. C. ^{[1
]}

Mawst, L. J. ^{[1
]}

Vurgaftman, I. ^{[3
]}

Meyer, J. R. ^{[3
]}

机构：

[1] Univ Wisconsin, Dept Elect & Comp Engn, Madison, WI 53706 USA

[2] MIT, Elect Res Lab, Cambridge, MA 02139 USA

[3] USN, Res Lab, Washington, DC 20375 USA

来源：

APPLIED PHYSICS LETTERS | 2010年 / 97卷 / 07期

基金：

美国国家科学基金会;

关键词：

current density; electro-optical effects; leakage currents; quantum cascade lasers; PERFORMANCE;

D O I：

10.1063/1.3478836

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The equations for threshold-current density J(th), differential quantum efficiency eta(d), and maximum wallplug efficiency eta(wp,max) for quantum-cascade lasers (QCLs) are modified for electron leakage and backfilling. A thermal-excitation model of "hot" injected electrons from the upper laser state to upper active-region states is used to calculate leakage currents. The calculated characteristic temperature T(0) for J(th) is found to agree well with experiment for both conventional and deep-well (DW) QCLs. For conventional QCLs eta(wp,max) is found to be strongly temperature dependent; explaining experimental data. At 300 K for optimized DW-QCLs, front-facet, continuous-wave eta(wp,max) values >20% are projected. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3478836]

引用

页数：3

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