采用扫描振镜方式的快调谐TEA CO_2激光器

Rapidly Tuned TEA CO_2 Laser by a Scanning Mirror

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。

To develop tunable trtansversely excited atmospheric（TEA） CO2 laser used in differential absorption lidar（DIAL） system,the kinetic characteristic of a TEA CO2 laser is investigated,base on the theory of six-temperature model rate equation.The output characteristic of the laser is calculated.A rapidly tuned TEA CO2 laser at high repetition frequency is manufactured by the result of calculation.With the method of a resonant reflecting mirror scanning a fixed grating,the rapidly tuned TEA CO2 laser output is realized.The pulse energy of spectral lines such as 10P（42）～10P（48） in fundamental-transverse mode is over 100 mJ at a repetition rate of 100 Hz,and the pulse width is no more than 100 ns.The far-field divergence angles of 10P（46） spectral line are 2.41 mrad（horizontal） and 2.27mrad（vertical）,namely,1.6 times of diffraction limitation.The laser can be tuned between two different rotational lines spanning the wavelength range within 10 ms.