中国激光, 2011, 38 (2): 0202004, 网络出版: 2011-01-21   

声光调Q CO2激光器的理论计算和实验研究

Theoretical Calculation and Experimental Study of Acousto-Optically Q-Switched CO2 Laser
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
2 中国科学院研究生院, 北京 100049
摘要
采用谐振腔内插入声光调制器的方法进行了小型CO2激光器的调Q实验,并根据影响激光器输出的诸多因素,利用调Q脉冲激光器速率方程对该激光器输出的主要技术参数进行了理论计算,据此提出了声光调Q CO2激光器优化设计的途径和方法。设计制成的声光调Q CO2激光器获得峰值功率超过4000 W,激光脉冲宽度为180 ns,与理论计算基本一致。激光器脉冲重复频率调节范围1 Hz~100 kHz。理论分析和实验结果均证明,调Q晶体中超声场的渡越时间并不会影响输出激光的脉冲宽度,因此无需在腔内插入光学透镜进行光束直径的压缩变换;渡越时间的影响只是体现在延长了激光脉冲的建立时间上;激光器的最佳工作频率在1 kHz左右,这与CO2分子0001能级大约1 ms的辐射寿命相匹配,当频率超过1 kHz时,激光的脉冲宽度随着频率的增加而开始加宽。激光器通过光栅选线的设计方式实现了9.2~10.8 μm的全波段波长调谐,测得激光输出谱线超过60条。
Abstract
Using resonator inserted with acousto-optically modulator, the experiments of the compacted CO2 laser are performed with Q-switch. According to various factors that influence the output of laser, the theoretical calculation of its main parameters are conducted by Q-switched pulsed laser rate equations. Based on the results, the technical route and approach are presented for optimization design of this laser. The measured peak power of the acousto-optically Q-switched CO2 laser is more than 4000 W and pulse width is 180 ns which agrees well with the theoretical calculation. The range of repetition frequency can adjust from 1 Hz to 100 kHz. The theoretical analysis and experimental results show that the acoustic traveling time of ultrasonic field can not influence the pulse width of laser so that it doesn′t require inserting optical lens in the cavity to reduce the diameter of beam. The acoustic traveling time only extends the establishing time of laser pulse. The optimum working frequency of laser is about 1 kHz, which it matched with the radiation life time (1 ms) of CO2 molecular 0001 energy level. When the frequency is above 1 kHz, the pulse width of laser increases with the frequency. The full band of wavelength tuning between 9.2 μm and 10.8 μm is obtained by grating selection one by one which the measured spectrum lines are over 60 in the condition of Q-switch.

谢冀江, 潘其坤, 李殿军, 张来明, 杨贵龙, 阮鹏, 郭劲. 声光调Q CO2激光器的理论计算和实验研究[J]. 中国激光, 2011, 38(2): 0202004. Xie Jijiang, Pan Qikun, Li Dianjun, Zhang Laiming, Yang Guilong, Ruan Peng, Guo Jin. Theoretical Calculation and Experimental Study of Acousto-Optically Q-Switched CO2 Laser[J]. Chinese Journal of Lasers, 2011, 38(2): 0202004.

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