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依据非链式脉冲氟化氘(DF)激光器的反应机理,采用速率方程理论,综合考虑了基态DF分子、D2分子、D原子、F原子对激发态DF分子的消激发作用,建立了非链式脉冲DF激光器反应动力学模型.运用Runge-Kutta法对该模型进行数值计算,得到了增益区内各组分粒子数密度随时间的变化关系.进而运用该模型研究了工作气体配比和输出镜反射率对DF激光器腔内光子数密度、单脉冲能量、脉冲宽度和输出功率的影响,得到了最佳气体配比和最佳输出镜反射率参数.采用放电引发方式对非链式DF激光器进行了实验研究,实验测得脉冲波形及单脉冲能量与速率方程理论模型计算结果基本一致.本文的研究结果可为非链式脉冲DF激光器的优化设计提供理论参考.
Based on the reaction mechanism of unchained pulsed deuterium fluoride (DF) lasers and the rate equation theory, the deconvergence of ground state DF molecules, D2 molecules, D atoms and F atoms on excited DF molecules has been considered. The kinetic model of the pulsed DF laser is given.Using the Runge-Kutta method to calculate the model, the relationship between the number density and the population density of each component in the gain region is obtained.Furthermore, the model is used to study the relationship between working gas ratio and output The effect of the reflectivity of the mirror on the photon number density, the pulse energy, the pulse width and the output power in the cavity of the DF laser was studied, and the optimal gas ratio and the optimal output mirror reflectivity were obtained. By using the discharge initiation method, The experimental results show that the calculated results of the pulse waveform and the single-pulse energy are in good agreement with the theoretical model of the rate equation.The results of this paper can provide theoretical reference for the optimization design of un-chained pulsed DF laser.