无热池的11μm附近腔内光强增强型热带连续波CO_2激光器(英文)

Intracavity intensity enhanced hot-cell-free 11 μm wavelength region hot band CW CO2 laser

介绍了一种腔内光强增强型凹面光栅选线法的热带连续波CO2激光器的设计及实验参数。在腔内不加CO2热吸收池,采用总气压为1 074.9 Pa、体积分数为13%CO2,15%N2和72%He的混合气体,放电电流为25 mA的情况下,除了在常规带0001-[1000,0200]Ⅰ,Ⅱ内观察到从R(56)到P(60)的100多条谱线以外,还得到11μm附近的其它谱线18条,其中0111-0310谱带9条,0111-1110谱带9条。实验发现,当激光器中氦气的比例升高时,激光的输出功率随之下降。每条谱线的腔内单程功率都超过35 W,足够满足大多数腔内光化学研究方面的需要。

The paper describes the design and construction of an intracavity intensity enhanced hot-band CW CO2 laser with the line selected by concave grating.In this laser,using a gas mixture of 13% CO2,15% N2 and 72% He（volume fraction） at a total pressure of 1 074.9 Pa and a discharge current of 25 mA,more than 100 laser lines are observed from R（56） to P（60） in the regular band 00^01-[10^00,02^00]Ⅰ,Ⅱ,besides,another 18 lines in 11 μm wavelength region with 9 lines in the 01^11-03^10 band and 9 lines in the 01^11-11^10 band,are also observed under the condition of no hot CO2 absorption cell in the cavity.In the experiment,it is found that the laser output power decreases when more helium gas is added to the laser gas mixture.The one-way intracavity power of every line is above 35 W,which is adequate for most intracavity photochemistry.