【作者】 谢冀江； 潘其坤； 李殿军； 张来明； 杨贵龙； 郭劲；

【Author】 Jijang Xie 1 Qikun Pan 1,2 Dianjun Li 1 Laiming Zhang 1 Guilong Yang 1 Jin Guo 1 (1Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Science,State Key Laboratory of Laser Interaction with Matter,Changchun jilin 130033,China) (2 Graduate School of the Chinese Academy of Sciences,Beijing 100039,China)

【机构】 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； 中国科学院研究生院；

【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QCO2激光器优化设计的途径和方法。设计制成的声光调QCO2激光器获得峰值功率超过4000W,激光脉冲宽度为180ns,与理论计算基本一致。激光器脉冲重复频率调节范围1Hz～100kHz。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1KHz左右,这与CO2分子0001能级大约1ms的辐射寿命相匹配,当频率超过1kHz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9.2μm～10.8μm的全波段波长调谐,测得激光输出谱线超过60条。更多还原

【Abstract】 Using resonator inserted with acousto-optically modulator,the experiments of the compacted CO 2 laser were performed with Q-switch.According to various factors that influenced the output of laser,the theoretical calculation of its main parameters was conducted by Q-switched pulsed laser rate equations.Based on the results,the technical route and approach were presented for optimization design of this laser.The measured peak power of the acousto-optically Q-switched CO 2 laser was more than 4000W and pulsed width was 180ns which agreed well with the theoretical calculation.The range of repetition frequency could adjust from 1 Hz to 100 kHz.The theoretical analyzes and experimental results showed that the acoustic traveling time of ultrasonic field could not influence the pulse width of laser so that it did not require inserting optical lens in the cavity to reduce the diameter of beam.The acoustic traveling time only extended 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 CO 2 molecular 00 0 1 energy level.When the frequency is above 1 kHz,the pulse width of laser increased with the frequency.The full band of wavelength tuning between 9.2 μm and 10.8μm was obtained by grating selection one by one which the measured spectrum lines were over 60 in the condition of Q-switch.更多还原