Electrically switchable, two-color quantum cascade laser emitting at 1.39 and 2.3 THz

被引：71
|
作者：
Scalari, G [1 ]
Walther, C
Faist, J
Beere, H
Ritchie, D
机构：
[1] Univ Neuchatel, Inst Phys, CH-2000 Neuchatel, Switzerland
[2] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England
来源：
APPLIED PHYSICS LETTERS | 2006年 / 88卷 / 14期
关键词：
D O I：
10.1063/1.2191407
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A quantum cascade laser emitting at 1.39 and 2.3 THz is demonstrated. The structure is based on a large single quantum well and multiwavelength operation is obtained by selectively injecting carriers by resonant tunneling in the excited states of the well. A magnetic field applied perpendicularly to the layers increases the gain enabling laser action. Extremely low values of the threshold current density (below 30 A/cm(2)) are observed for both wavelengths. A study of the dependence of the laser emission intensity as a function of the applied magnetic field is also presented.
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页数：3
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