Highly Sensitive Tunable Diode Laser Absorption Spectroscopy of CO₂ Around 1.31μm

Fifteen new absorption lines are observed when studying CO₂ absorption spectroscopy by wavelength modulation (WM) technique with a distributed feedback laser. The overtone spectra of CO₂ around 1.31μm and the corresponding spectral parameters (i.e. positions, intensities, self-broadening coefficients) are presented. The intensity of the weakest line detected is 2.25163×10^-27cm^-1/(molecule.cm^-2 at the pressure of 5Torr, with a corresponding absorption of 3.88×10^-8