High-resolution absorption spectra of real atmosphere at 1.315μm
The high-resolution absorption spectra of real atmosphere near the 1.315μm wavelength were recorded accurately using an experimental system. The system includes a tunable narrow-line-width pulsed OPO laser, a multipass absorption cell of the White-type with total optical length of 1097m, and a single time-division multiplexing fast-response detector. The absorption cross-section of atmospheric absorption molecule at the 7 603.14cm -1 wavelength of iodine laser was measured (1.05±0.09)×10 -24 cm 2 at the standard atmospheric condition. And the parameters of atmospheric absorption lines including the central position, strength and air-broadening half-width were also obtained around the wavelength of 1.315μm from the measured spectra of real atmosphere. It is found that the minimum absorption cross-section calculated from these parameters is (8.9±0.8)×10 -25 cm 2 at the wavelength of 7 603.31 and 7 603.93cm -1 , respectively. This value is less than 15% of that at the iodine laser wavelength.