为获得中心波长9.3 μm激光的高功率输出，利用高功率脉冲 CO2激光器进行选支实验研究。采用腔镜镀膜选支技术，通过控制对不同波长的透射率或反射率参数，在稳定腔和非稳腔中都得到了中心波长9.3 μm激光的单谱线输出。在相同工作参数下，稳定腔中心波长9.3 μm激光的能量为其原中心波长10.6 μm激光的95%，非稳腔中心波长9.3 μm激光的能量为其原中心波长10.6 μm激光的93%，两种腔型中心波长9.3 μm激光热敏纸光斑颜色与中心波长10.6 μm激光的有明显不同。实验表明，采用腔镜镀膜选支技术在稳定腔和非稳腔中都能获得中心波长9.3 μm激光的单谱线输出，且激光能量与原腔型输出中心波长10.6 μm激光的基本相当。激光热敏纸光斑显示出在相同单脉冲能量作用下，中心波长9.3 μm激光对物质的冲蚀作用高于中心波长10.6 μm的激光。

For obtaining high power 9.3 μm laser, high power pulse CO2 laser is used to select band. Band selection is done by resonator mirror filming. By controlling the transmittance or reflectivity of different wavelengths, 9.3 μm laser is got both in stable resonators and unstable resonators. With the same operation parameters, the energy of 9.3 μm laser is 95% of 10.6 μm in stable resonators, while 93% in unstable resonators. Both in two different resonators, the thermo-sensitive paper colors by 9.3 μm laser are evidently different from those by 10.6 μm laser. Experimental results show that the resonator mirror filming method can lead 9.3 μm laser output both in stable and unstable resonators, and the energy is changing slightly. The thermosensitive paper displays the 9.3 μm laser has stronger impact erosion than the 10.6 μm laser.