冷气流引射式小型DF激光器紧凑度分析

对影响冷气流引射式小型DF激光器紧凑度的主要因素进行了分析，以功率-气源体积比作为评价紧凑度的指标，在多种参数条件下对功率-气源体积比进行了计算，结果表明，随着激光器喷管列阵质量流面密度的增加，功率-气源体积比先增大后减小，并在喷管列阵质量流面密度约为3.3 gs-1cm-2时取得最大值；在激光尾气参数相同的情况下，提高引射喷管总压可获得更大的功率-气源体积比，但随着引射喷管总压的提高，引射喷管总压对功率-气源体积比的影响逐渐减弱；与氦气做引射工质相比，采用氮气和空气做引射工质可获得更大的功率-气源体积比。

Compactness analysis of small scale DF laser with cooling gas ejector

Influence factors of compactness of DF laser with cooling gas ejector were analyzed. Ratio of Laser Power to Gas Source Volume(RPGV) was chosen as DF laser compactness evaluation index and was calculated at different conditions. According to the result, RPGV increases at first, and then decreases with increasing nozzle array mass flux. RPGV gets maximum value when nozzle array mass flux is about 3.3 gs-1cm-2. In the case of same laser effluent parameters, increasing ejector driving gas total pressure leads to a bigger RPGV, but its effect on RPGV gradually becomes weak. Compared with helium as ejector driving gas, adopting nitrogen and air as ejector driving gas leads to higher RPGV.