High-resolution absorption spectrum of water vapor near 1.315 μm

The study of absorption property of water vapor is valuable for laser communication and transmission of laser. The study of spectra of water vapor is important to theoretical and engineering utility. The high-resolution absorption spectra of water vapor near 1.315 μm wavelength were recorded accurately using a DFB (distributed-feedback) diode laser operating at 1.315 μm and a White type multi-pass cell. The diode laser has narrow line width and wide tune range. Total optical length in the multi-pass cell can be varied in a wide range, the maximum optical length is 1097 nm. Using the recorded spectra, line shape parameters of some water vapor re-vibrational overtones near 1.315 μm were measured at room temperature, line strengths, line positions and self-broadening coefficients were obtained. The measured data agree well with that in the HITRAN database. Advanced electronic technology and computer control technology were used in experiment which improved the efficiency greatly and assured the reliability of the measured data.