Absorption measurements for highly sensitive diode laser of CO₂ near 1.3μm at room temperature

Fifteen new absorption lines were observed when studying CO₂ absorption spectroscopy by wavelength modulation 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 667Pa, with a corresponding absorption of 3.88×10^-8.