TEA CO_2激光器11μm波段谱线特性研究

The Study on the Output Character of 11μm Wavelength Region TEA CO_2 Laser

采用双光栅谐振腔和增长放电增益区的方法,进行了TEA CO2激光器11μm波段谱线输出特性研究。在混合气体的比例为CO2∶N2∶He=70∶90∶270和总压430×133.3Pa情况下,获得数条谱线的激光输出。着重研究了波长为11013nm的激光谱线的输出特性,其脉宽为400ns左右,且脉宽随电压变化。谱线能量随光栅中心的位移而变化,当光栅中心在放电区中心轴线上时有最大的能量输出。光斑能量分布接近低阶模或基模分布。

Adopting the two grating cavities and lengthening the gain region of discharge, the output character of the TEA CO2 11μm lines were studied. Under the optimum proportion of mixing gases 18.4% CO2, 23.7% N2, 57.9% He and at total pressure of 430 ×133.3Pa, several laser lines were observed. The output character of the laser line is studied which wavelength is 11013nm. The pulse width of wavelength 11013nm is 400ns around and the pulse width varies with the main discharge voltage variation. Line＇s energy varies with the displacement of grating. While the centre of grating is in the axis of discharge chamber, the maximal energy output will appear. The energy distribution of the spot is close to the energy distribution of the lower-order mode or fundamental mode.