摘要
采用负压采样专用气相色谱仪对大功率横流自持放电ＣＯ激光器的工作气体成分进行了在线检测．实验发现，随着激光器运行时间的增加，工作气体中Ｏ２和ＣＯ浓度的下降速度是１∶２的关系，说明放电过程中生成了ＣＯ２气体．同时对ＣＯ２浓度的检测指出，ＣＯ２浓度的增加严重影响了激光输出功率的提高．为此认为采用慢换气技术及增大液氮流量或安装ＣＯ２收集器这两项措施可有效减缓激光工作气体的劣化速度，延长激光器工作时间．最后，讨论了影响放电稳定性的原因，分析了温度、流场等的不均匀性对放电稳定性的影响．
? A gas chromatograph for gas analysis below atmospheric pressure was used to detect on line the working gases of high power transverse flow self sustained discharge excited CO laser. It was discovered experimentally that with the increasing of operation time, the concentration of O 2 and that of CO 2 had been reduced. Furthermore, the increasing of CO 2 concentration seriously limited the improvement of laser output power. Then, it is concluded that this problem can be solved effectively by means of slow gas exchange, increasing N 2 flow rate or installing CO 2 collectors. Finally, the factors resulting in discharge instabilities are also discussed.
出处
《大连理工大学学报》
CAS
CSCD
北大核心
1999年第1期34-38,共5页
Journal of Dalian University of Technology
基金
国家自然科学基金
