| 飞秒激光结合啁啾太赫兹脉冲控制CO分子取向 |
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| 引用本文： | 杨明惠,金琪,刘劲松,王可嘉,杨振刚. 飞秒激光结合啁啾太赫兹脉冲控制CO分子取向[J]. 激光技术, 2015, 39(6): 735-740. DOI: 10.7510/jgjs.issn.1001-3806.2015.06.001 |
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| 作者姓名： | 杨明惠 金琪 刘劲松 王可嘉 杨振刚 |
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| 作者单位： | 1.华中科技大学 武汉光电国家实验室, 武汉 430074 |
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| 摘 要： | 为了研究啁啾太赫兹脉冲诱导后的CO分子取向,采用刚性转子近似求解含时薛定谔方程的方法,进行了理论分析和数值仿真.为了在较低太赫兹场强时获得较好的取向效果,采用了飞秒激光结合啁啾太赫兹脉冲的方案.结果表明,分子取向程度可增强81%.在有限温度条件下,飞秒激光结合啁啾太赫兹脉冲诱导分子取向的效率随温度的升高而降低;相对于少周期太赫兹脉冲,啁啾太赫兹脉冲有诱导分子取向的优越性.这一结果对提高CO分子取向程度是有意义的.
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| 关 键 词： | 激光物理 分子取向 刚性转子模型 啁啾太赫兹脉冲 |
| 收稿时间： | 2015-01-13 |
CO molecular orientation controlled by combination of chirped THz pulse and femtosecond laser pulse |
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| Abstract: | In order to study the orientation behaviors of CO molecules induced by chirped terahertz pulse, the time-dependent Schrdinger equation was solved by means of rigid rotor approximation for theoretical analysis. In order to achieve high degree of molecular orientation in chirped terahertz pulse at a low intensity, the method by utilizing chirped terahertz pulse in combination with femtosecond laser pulse was proposed. The results show that the molecular orientation degree can be enhanced about 81%, and that the orientation efficiency decreases with the rise of temperature in finite temperature range. Compared with the few-cycle terahertz pulse, chirped terahertz pulse has more advantages in inducing molecular orientation. The result is meaningful to enhance the CO orientation degree. |
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