摘要
An asymmetric quantum well (AQW) is designed to emit a terahertz (THz) wave by using difference frequency generation (DFG) with the structure of GaAs/Al_(0.2)Ga_(0.8)As/Al_(0.5) Ga_(0.5)As under a doubly resonant condition.It is found that the second-order nonlinear susceptibility χ^((2)) varies with the two pump wavelengths,and it can reach the peak value of 1.61 μm/V when the wavelengths are given as λ_(p1) =9.756 μm and λ_(p2) =10.96 μm,respectively.The numerical results show that the refractive index of one pump wave in the AQW is concerned with not only its own wavelength but also the other wavelength.Phase-matching inside the AQW can be obtained through the tuning of the two pump wavelengths.
作者
CAO Xiao-Long
WANG Yu-Ye
XU De-Gang
ZHONG Kai
LI Jing-Hui
LI Zhong-Yang
ZHU Neng-Nian
YAO Jian-Quan
曹小龙;王与烨;徐德刚;钟凯;李敬辉;李忠洋;朱能念;姚建铨(College of Precision Instrument and Opto-electronics Engineering,Institute of Laser and Opto-electronics,Tianjin University,Tianjin 300072;Key Laboratory of Opto-electronics Information Technology(Ministry of Education),Tianjin University,Tianjin 300072;Department of Computer Science and Technology,Renai College,Tianjin University,Tianjin 301636)
基金
Supported by National Natural Science Foundation of China under Grant Nos 60801017,61172010,61101058,and 61107086
the Science and Technology Committee of Tianjin under Grant No 11JCYBJC01100.
