Terahertz sources based on Cerenkov difference-frequency generation in quantum cascade lasers

被引：99
|
作者：
Vijayraghavan, Karun [1 ]
Adams, Robert W. [1 ]
Vizbaras, Augustinas [2 ]
Jang, Min [1 ]
Grasse, Christian [2 ]
Boehm, Gerhard [2 ]
Amann, Markus C. [2 ]
Belkin, Mikhail A. [1 ]
机构：
[1] Univ Texas Austin, Dept Elect & Comp Engn, Austin, TX 78758 USA
[2] Tech Univ Munich, Walter Schottky Inst, D-85748 Garching, Germany
来源：
APPLIED PHYSICS LETTERS | 2012年 / 100卷 / 25期
基金：
美国国家科学基金会;
关键词：
SECOND-HARMONIC GENERATION; WAVE-GUIDES; RADIATION;
D O I：
10.1063/1.4729042
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We report room-temperature terahertz sources based on Cerenkov difference-frequency generation in dual-wavelength mid-infrared quantum cascade lasers with giant resonant optical nonlinearities originating from intersubband transitions. A Cerenkov difference-frequency generation scheme allows for extraction of THz radiation along the whole length of the laser waveguide and provides directional terahertz emission. Experimentally, our sources demonstrate a conversion efficiency of up to 70 mu W/W-2 approximately an order of magnitude improvement over the previous reports. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4729042]
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