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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。
When the working gas temperature changes, pulsed TEA CO_2 laser output wavelength may also change, the phenomenon known as the output wavelength temperature drift. By establishing a six temperature theoretical model, the temperature drift of the output wavelength of the pulsed TEA CO 2 laser with a flat-concave stable cavity is revealed numerically. The results show that the output spectrum of this laser is multispectral structure, the working gas temperature increases and the laser output wavelength moves to long wavelength; the working gas temperature decreases and the laser output wavelength moves to short wavelength. The calculation results also show that the laser output wavelength is limited to 10P branch with the temperature drift and there is no cross-band movement between the 9μm band and the 10μm band. Therefore, the grating resonator can suppress the temperature drift of the pulsed TEA CO_2 laser output wavelength, Stable laser output wavelength.