| Morse势阱中三次谐波产生的研究 |
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| 引用本文： | 于凤梅,郭康贤,陈红斌.Morse势阱中三次谐波产生的研究[J].仲恺农业技术学院学报,2005,18(2):32-36,46. |
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| 作者姓名： | 于凤梅 郭康贤 陈红斌 |
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| 作者单位： | 1. 仲恺农业技术学院,计算机与电子工程学院,广东,广州,510225
2. 广州大学,物理系,广东,广州,510405 |
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| 摘 要： | 利用量子力学中的密度矩阵算符理论,推导在具有多频率的复光场作用下线性和非线性极化率的一般表达式,然后利用图形技术,即利用费曼(Feynman)图方法来考虑三阶非线性过程,得到三次谐波系数的解析表达式.并以典型的GaAs/AlGaAs Morse势阱为例引入参数进行数值计算.结果表明,在该系统中得到了比体材料大的三次谐波系数,并适当增大势阱参数a可以获得较大的三次谐波系数;三次谐波系数随着弛豫常数hГ减小而增大.
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| 关 键 词： | 非线性光学 三次谐波产生 Morse势阱 密度矩阵方法 图形技术 |
| 文章编号： | 1006-0774(2005)02-0032-05 |
Study on the third- harmonic generation in Morse quantum well |
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| YU Feng-mei,GUO Kang-xian,CHEN Hong-bin.Study on the third- harmonic generation in Morse quantum well[J].Journal of Zhongkai Agrotechnical College,2005,18(2):32-36,46. |
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| Authors: | YU Feng-mei GUO Kang-xian CHEN Hong-bin |
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| Abstract: | The linear and nonlinear susceptibilities had been obtained by the compact-density-matrix approach in presence of the multifrequency incident optical field. An analytic formula for third-harmonic-generation was presented by graphic technology(Feynman). Numerical results were presented for typical GaAs/AlGaAs Morse quantum well. The results showed that third-harmonic-generation increased with the enhancement of a and decreased with relaxation constant increasing. Therefore, if the parameter was increased or the relaxation constant was reduced with the effects on the system associated by environment and other factors limited to minimum,a large third-harmonic-generation coefficient would be obtained. |
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| Keywords: | nonlinear optics the third-harmonic generation Morse quantum well density matrix method graphic technology |
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