放电引发重频HF/DF激光器具有的波长和功率优势使其成为当前中红外激光技术研究的热点之一。介绍了在利用紫外预电离横向放电结构建立的放电引发重频HF激光装置上，通过对气体循环系统增益区流场结构分析和注入管道结构的优化设计开展的重频能量稳定输出实验研究。实验结果表明，通过管道结构的优化设计，放电增益区流场均匀性得到明显改善，气体置换的最低流速达到6.5 m/s，激光器稳定运行频率由60 Hz提高到100 Hz，且稳定体放电的单位体积放电沉积能量由1.6 J/(ml?atm)(1 atm=1.013×105 Pa)提高到2.0 J/(ml?atm)，激光平均功率达到40 W。

For the characteristics of wavelength and output power，discharge initiated repetitively pulsed HF laser has become the hotspot in mid-infrared laser device technology research field. In this paper, numerical simulation of flow field in discharge region and structure design of inject pipeline with repetitively pulsed HF laser device was described. Under the investigation of discharge characteristics in SF6/C2H6 gas mixture and output characteristics of laser pulse, the flow field uniformity and repetitively pulsed laser energy stability were researched. It is shown that with the optimized design of inject pipeline, the flow field uniformity improved obviously. The minimum flow velocity for gas circulation is elevated to 6.5 m/s. The deposited energy per unit volume gas with stable volum discharge increased from 1.6 J/ml?atm to 2.0 J/ml?atm. The maximal running frequency of 100 Hz and the average power of 40 W are obtained. The system operating stability keeps well.