脉冲TEA CO2激光器输出波长的温度漂移

当工作气体温度变化时,脉冲TEA CO_2激光器的输出波长也可能发生变化,此现象称为输出波长的温度漂移。通过建立六温度理论模型,用数值计算的方法揭示了平凹稳定腔脉冲TEA CO_2激光器输出波长的温度漂移规律。计算结果表明,这种激光器输出光谱为多谱线结构,工作气体温度升高,激光输出波长向长波长方向移动;工作气体温度降低,激光输出波长向短波长的方向移动。计算结果还表明,激光输出波长随温度的漂移局限在10P支内,没有9μm带与10μm带之间的跨带移动,因此,采用光栅谐振腔,可抑制脉冲TEA CO_2激光器输出波长的温度漂移,稳定激光输出波长。

Wavelength-Temperature Shift of a Pulsed TEA CO2 Laser

The output wavelength would change according to the change of the temperature of the gas mixture in a pulsed TEA CO_2 laser,which is called the wavelength-temperature shift.A theoretical model based on the six- temperature mode rate equations is suggested to interpret such a phenomenon,which is used to calculate the wavelength-temperature shift relation of a TEA CO_2 laser with piano-concave stable resonator.The numerical results indicate that the laser simultaneously generates several transition lines at one laser pulse,and the wavelength keeps positive change with the change of the ambient temperature.In addition,the laser's wavelength-temperature shift occurs merely within the 10P branch no matter what ranges the temperature varies.So a grating resonator can easily eliminate the shift and keep the laser output spectra stable.