CO2激光器泵浦CH3OH产生THz 激光的理论分析

江汉大学学报（自然科学版） ›› 2014, Vol. 42 ›› Issue (1): 40-44.

CO₂激光器泵浦CH₃OH产生THz 激光的理论分析

兰慧^1，2

1.江汉大学物理与信息工程学院，湖北武汉 430056；2.华中科技大学光学与电子信息学院武汉光电国家实验室，湖北武汉 430074

出版日期:2014-02-25 发布日期:2014-04-14
作者简介:兰慧（1982—），女，讲师，博士生，研究方向：激光与THz技术。

Theoretical Analysis of THz Laser Produced by CO₂ Laser Pumped CH₃OH

LAN Hui^1，2

1.School of Physics and Information Engineering，Jianghan University，Wuhan 430056，Hubei，China；2.Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology，Wuhan 430074，Hubei，China

Online:2014-02-25 Published:2014-04-14

摘要/Abstract

摘要： 以激光速率方程理论为基础出发点，搭建出三能级系统模型，从而对光泵的CH₃OH 分子产生THz激光机理和动力学过程做了理论分析。结合实验参量，使用CO₂激光器输出的9P（36）支线泵浦CH₃OH气体分子产生118. 8 μm 的THz激光，并在工作气压为10 Pa，温度为常温（20 ℃）下，分析了三能级粒子数密度变化情况及输出功率波形特征，以及改变缓冲气压、腔内温度和输出镜反射率的情况下，对激光输出功率的影响。结果表明，理论计算结果能较好地反映光泵产生THz激光的过程。

关键词: 速率方程, CH₃OH分子, THz, 光泵

Abstract: Established a model of three-energy-level system from the laser rate equation theory，and then analysed the molecular dynamic processes and laser mechanism of the THz laser produced by optically pumped CH₃OH. According to the experimental parameters，the CO₂ lasers were used to pump CH₃OH to emit pulsed THz laser lines. When the 9P（36）line of CO₂ lasers pumps CH₃OH，the 118.8 μm line radiation was obtained，and then analysed the three-energy-level system's particles number and the characteristics of the output waveform at the pressure of 10 Pa and the temperature at 20 ℃，as well as the influence of buffer gas pressure ，intracavity temperature and output coupler reflectivity on laser output power. The results show that the theorectical computation can well reflect the process of generation of THz laser produced by optical pump.

Key words: rate equation, CH₃OH molecule, terahertz, optical pump

中图分类号:

TN248.2

兰慧. CO₂激光器泵浦CH₃OH产生THz 激光的理论分析[J]. 江汉大学学报（自然科学版）, 2014, 42(1): 40-44.

LAN Hui. Theoretical Analysis of THz Laser Produced by CO₂ Laser Pumped CH₃OH[J]. Journal of Jianghan University(Natural Science Edition), 2014, 42(1): 40-44.

CO₂激光器泵浦CH₃OH产生THz 激光的理论分析

Theoretical Analysis of THz Laser Produced by CO₂ Laser Pumped CH₃OH

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