声光调QCO_2激光器

Acousto-optically Q-switched CO_2 laser

为满足激光测距、环境探测、空间通讯及激光与物质相互作用机理研究等领域应用要求,研制了声光调QCO2激光器。针对影响声光调QCO2激光器输出的各种因素,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分析和计算,提出了声光调QCO2激光器优化设计的方法,并进行了验证实验。激光器脉冲重复频率为1Hz^50 kHz,在1 kHz运转时获得的输出激光脉冲宽度为180 ns,峰值功率为4 062 W,与理论计算基本一致。结果证明:通过声光晶体(AO)的优选及谐振腔的合理设计,可实现小型CO2激光器的高重频、窄脉宽,高峰值功率输出,并可通过光栅选线的设计方式和TTL信号控制实现此类激光器的波长调谐和编码输出。

An acousto-optically Q-switched CO2 laser is developed to satisfy the requirements of re- search fields such as laser ranging, environmental detection, spacial communications and the mechanism study of the interaction between laser and materials. In consideration of the influence of various factors on the outputs of the acousto-optically Q-switched CO2 laser, an optimization method to design the acousto-optically q-switched CO2 laser is presented by using the theoretical analysis and calculations of the laser rate equations for the main parameters of laser outputs. Then,a verified experiment is undertaken. The experimental results show that the laser can offer the laser parameters in the pulse repetition frequency （PRF） of 1 Hz--50 kHz,a pulse width of 180 ns and a peak power of 4 062 W, which agrees with the theoretical results well. The results demonstratethat a miniature laser with high repetition rates, narrow pulse widths and high peak powers can be realized by optimally choosing an acousto-optically Q-switched crystal and rationally designing an optical resonator, and it can also realize the wavelength tuning and coding output by selecting the grating lines and controlling the TTL signals.