λ∼7.1 μm quantum cascade lasers with 19% wall-plug efficiency at room temperature

被引：68
作者：
Maulini, Richard [1 ]
Lyakh, Arkadiy [1 ]
Tsekoun, Alexei [1 ]
Patel, C. Kumar N. [1 ,2 ]
机构：
[1] Pranalytica Inc, Santa Monica, CA 90401 USA
[2] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
来源：
OPTICS EXPRESS | 2011年 / 19卷 / 18期
关键词：
PERFORMANCE;
D O I：
10.1364/OE.19.017203
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Strain-balanced In0.6Ga0.4As/Al0.56In0.44As quantum cascade lasers emitting at a wavelength of 7.1 mu m are reported. The active region is based on a three-phonon-resonance quantum design with a low voltage defect of 120 meV at injection resonance. A maximum wall-plug efficiency of 19% is demonstrated in pulsed mode at 293 K. Continuous-wave output power of 1.4 W and wall-plug efficiency of 10% are measured at the same temperature, as well as 1.2 W of average power in uncooled operation. A model for backfilling of the lower laser level which takes into account the number of subbands in the injector is presented and applied to determine the optimum value of the voltage defect to maximize wall-plug efficiency at room temperature, which is found to be similar to 100 meV, in good agreement with experimental results. (C) 2011 Optical Society of America
引用
收藏
页码：17203 / 17211
页数：9
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