| CO2激光差频GaSe晶体产生太赫兹波的数值计算 |
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| 引用本文： | 姜可,谢冀江,张来明,骆聪. CO2激光差频GaSe晶体产生太赫兹波的数值计算[J]. 红外与激光工程, 2013, 42(5): 1223-1227 |
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| 作者姓名： | 姜可 谢冀江 张来明 骆聪 |
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| 作者单位： | 1.中国科学院长春光学精密机械与物理研究所 激光与物质相互作用国家重点实验室,吉林 长春 130033; |
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| 基金项目： | 激光与物质相互作用国家重点实验室开放基础研究课题（SKLLIM1012） |
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| 摘 要： | 以可调谐CO2激光差频非线性GaSe晶体为例，在共线相位匹配方式下，计算了oe-e和oe-o两种相位匹配方式下的角度调谐特性、有效非线性系数、走离角和允许角。结果表明:GaSe晶体可产生73.84～3 000 m的太赫兹波，且有效非线性系数为41～54 pm/V；走离角在1.771～10.63之间；所允许的最大发散角为13.95～94.7 mrad，对入射光的方向性要求较高。对于500 m以上的太赫兹波，两种匹配方式除有效非线性系数外没有大的区别。模拟结果对于开展基于激光差频技术产生太赫兹的研究具有重要的指导意义。
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| 关 键 词： | 差频 太赫兹 CO2激光 GaSe晶体 相位匹配 |
| 收稿时间： | 2013-02-11 |
Simulation on THz radiation via difference frequency mixing of CO2 laser in GaSe crystal |
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| Affiliation: | 1.State Key Laboratory of Laser Interaction with Matter,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China;2.University of Chinese Academy of Sciences,Beijing 100049,China |
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| Abstract: | The process that Q switched tunable CO2 laser pumps nonlinear GaSe crystal was studied. Based on the collinear phase match type, the phase matching angle, effective nonlinear coefficient, walk-off angle and acceptant angle were calculated. The results are as follow: THz wave between 73.84 and 3 000 m can be generated using DFG based on GaSe crystal which has high effective nonlinear coefficient of 41-54 pm/V. The walk off angle is big, which is between 1.771 and 10.63. With the small acceptant angle 13.95-94.7 mrad, the requirement in directional property is strict. When the THz wavelength is above 500 m, the two phase matching types, oe-e and oe-o, are very similar except the effective nonlinear coefficient. In experiments, it was up to the experiment conditions to decide which type to choose. The simulation result can guide the experiments about DFG in GaSe crystal. |
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