1·31μm附近CO_2的高灵敏度吸收光谱

Highly Sensitive Tunable Diode Laser Absorption Spectroscopy of CO_2 around 1.31 μm

采用可连续调谐半导体二极管激光器作为探测光源，将长程多通池吸收光谱、波长调制和谐波探测技术相结合，建立了一套具有高检测灵敏度和高分辨率的测量气态分子光谱及进行微量分析的研究装置。可以测量6．67×10^2Pa下～10^-27cm^-1·（molecule·cm^-2）^-1的强度，最小可探测吸收达到～10^-8。并利用该装置测量了CO2气体在1．31μm附近的近红外吸收光，并用最小二乘法拟合实验数据获得这一波段谱线的参数。同时测量的谱线参数与HITRAN数据库相比，发现15条数据库上没有报道的弱谱线。

Fifteen new absorption lines were observed when studying （WM） technique with a DFB laser. The line intensity we can detect is COz absorption spectroscopy by wavelength modulation 2. 251 63×10^-27 cm ^-1 . （moleeuleem^-2）^-1 at 6.67×10^2 Pa pressure, corresponding to an absorbance of 3. 88×10^-8. The overtone spectra of CO2 around 1.31 μm have been measured with a tunable diode laser and the corresponding spectral parameters （positions, intensities, and seKbroadening coefficients） are presented.