Output character of sequence band lines of TEA CO2 laser

The study of the TEA CO2 weak lines were carried out by adopting two grating cavities and lengthening the gain region of the discharge chamber. Six near 11 μm weak lines (sequence band and hot band lines) were obtained successfully with 16% CO2, 21% N2, 63% He (volume ratio) at total pressure of 57.3 kPa. The pulse width of weak lines is 400 ns around. While the center of grating is on the axis of the discharge chamber, the maximal energy output appears, which is several hundred mJ.