电激励连续波HF/DF选线化学激光器光轴的选择

 在一单放电管电激励连续波HF/DF化学激光器平台上，利用一级振荡、一级输出的光栅选线色散腔结构，分别在H2喷注孔平面下游0.5 mm和2.0 mm两个位置处测试了此激光器的选线性能。谱线指认的结果证实，即使在mm级的流场方向增益长度范围内，选线激光器要获得宽的谱线覆盖范围并优化各支谱线的功率谱分布，光轴到氢气喷注孔平面的距离是一个重要的调节参量，随着此距离的增大，高振动态之间的跃迁越来越弱，而低振动态之间的跃迁则越来越强。

Chosing cavity axis for a discharge driven CW line-selected HF/DF chemical laser

Taking HF lasing as an example,line selecting performance of a single tube discharge driven subsonic CW HF/DF chemical laser was tested with grating dispersive cavity under the 1st order oscillating 1st coupling mode.The difference between the results of setting cavity axis at 2.0 mm and 0.5 mm downstream of hydrogen injecting orifice is dramatic.The results of the spectrum identification indicate that even for the subsonic chemical laser device,which owns only millimeter range flow direction's active length,line selected performance is greatly influenced by the cavity axis' relative position to the H_2 injecting orifice.With the increase of this range,the transitions between the higher vibration states tend to be weaker,while the transitions between lower vibration-states more stronger.