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为了研制适用于激光差分吸收雷达(DIAL)的可调谐横向激励大气压(TEA)CO2激光器,利用六温度模型速率方程理论,分析了TEA CO2激光器的动力学特性,计算了激光器的各种输出特性.设计研制了一台高重复频率快调谐TEA CO2激光器,采用共振扫描镜扫描固定光栅的方案实现了激光的快调谐输出.当激光器高重复频率运转时,得到弱支谱线如10P(42)~10P(48)支谱线基横模能量大于100 mJ,脉冲宽度小于100 ns.10P(46)支谱线的远场发散角为2.41 mrad(水平),2.27 mrad(竖直),约为1.6倍衍射极限.实现了任意波长两条谱线在10 ms内快速切换输出.
In order to develop a tunable transversely excited atmospheric pressure (TEA) CO2 laser suitable for DIAL, the kinetic characteristics of a TEA CO2 laser are analyzed and the output characteristics of the laser are calculated by using the six temperature model rate equation theory. A high repetition rate tuned TEA CO2 laser is designed and developed, and the laser fast tuning output is realized by using the resonant scanning mirror to scan and fix the grating. When the laser operates at high repetition rate, weak branch lines such as 10P (42) ~ The transverse mode energy of the 10P (48) branch line is greater than 100 mJ and the pulse width is less than 100 ns.10P (46) The far-field divergence angle of the branch line is 2.41 mrad (horizontal) and 2.27 mrad (vertical) Double the diffraction limit, enabling fast switching of the two spectral lines at any wavelength within 10 ms.