Bloch gain in quantum cascade lasers

被引：0
|
作者：
Terazzi, R. [1 ]
Gresch, T. [1 ]
Giovannini, M. [2 ]
Sekine, N. [3 ]
Faist, J. [1 ]
机构：
[1] ETH, Quantum Optoelect Grp, Inst Quantum Elect, Wolfgant Pauli Str 16, CH-8093 Zurich, Switzerland
[2] Univ Neuchatel, Inst Phys, CH-2000 Neuchatel, Switzerland
[3] Univ Tokyo, Inst Ind Sci, Tokyo 1538505, Japan
来源：
NOVEL IN-PLANE SEMICONDUCTOR LASERS VII | 2008年 / 6909卷
关键词：
bloch oscillator; second order gain; quantum cascade laser; semiconductor laser; infrared; coherent scattering; gain measurement; multi-section technique;
D O I：
10.1117/12.774258
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：
Laser action by a weak to vanishing population inversion is observed in mid-infrared (7 mu m) quantum cascade lasers. The origin of the optical gain is the same than for the Bloch oscillator predicted in superlattices. This special gain does not only relax the threshold condition for lasing, but also underlines the major role played by coherent processes in semiconductor heterostructures, as it is based on scattering assisted optical transitions.
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页数：11
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