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| 基于子带跃迁的非对称GaAs量子阱的三阶非线性系数研究 | |
| 引用本文： | 车永莉,曹小龙,姚建铨. 基于子带跃迁的非对称GaAs量子阱的三阶非线性系数研究[J]. 枣庄师专学报, 2013, 0(5): 19-24 |
| 作者姓名： | 车永莉 曹小龙 姚建铨 |
| 作者单位： | [1]曲阜师范大学信息技术与传播学院,山东日照276826 [2]山东科技大学机械电子工程学院山东青岛266590;天津大学精密仪器与光电子工程学院,天津300072 |
| 基金项目： | 国家自然科学基金（项目编号：61271066）;山东省2013年科技发展计划项目（项目编号：2013GGA01021）;曲阜师范大学校级项目（项目编号：XJ200948）. |
| 摘 要： | 设计了一种适用于CO2激光器双波长泵浦的非对称结构的Al0.2Ga0.8As/GaAs/Al0.5Ga0.5As量子阱结构,用以差频产生THz波.运用密度矩阵理论和迭代方法计算了这种非对称量子阱的三阶非线性系数,并研究了其随两束差频泵浦光波长的变化.结果表明,量子阱对两束差频泵浦光的三阶非线性系数x（3）ω1和x（3）ω2随两束泵浦光波长的增大都是出现先增大再减小的变化趋势,峰值都位于9.756μm（λp2=10.64μ m）和10.96μm（λp1=9.69μm）,相应的峰值大小为1.185×10-20m2V-2、8.002×10-21m2V-2和2.98×10-19m2V-2和8.565×10-20m2V-2. |
| 关 键 词： | 非线性系数 非对称量子阱 太赫兹波 差频 |
The Third Order Nonlinear Coefficient Due toIntersubband Transitions in GaAs Asymmetric Quantum Wells |
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| Affiliation: | CHE Yong - li, CAO Xiao - long , YAO Jian - quan ( 1. School of 276826, China; 2. and Technology, Information Technology and Communication, Qufu normal University, Rizhao, College of Mechanical and Electronic Engineering, Shandong University of Science Qingdao , 266590, China ;3. College of Precision Instrument and Opto - electronics Engineering, Institute of Laser and Opto- electronics, Tianjin University, Tianjin 300072, China) |
| Abstract: | An asymmetric quantum well （AQW） is designed to emit terahertz （THz） wave by using difference frequency gener- ation （DFG） with the structure of GaAs/Al0. 2 Ga0.8 As/Al0. 5 G a0. 5 As. The density matrix theory and iterative method are apphed to obtain the third order nonlinear coefficient. Subsequently, the third order nonlinear coefficients as a function of the two pump wavelengths are be researched. The results indicate that the two third order nonlinear coefficients increase first and then de- crease with wavelength increasing. The peak values are 1. 185 × 10-20m2V-2 , 8. 002 × 10-21 m2V-2, 2.98 × l0-19m2V-2 and 8. 565 × 10 -20m2V-2, locating at 9. 756μm （ λp2 = 10.64μm） and 10.96μm（ λp1= 9.69μ）. |
| Keywords: | nonlinear coefficient asymmetric quantum wells THz - wave difference frequency |
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