1.315 μm波长附近实际大气高分辨率吸收光谱

 用窄线宽、脉冲可调谐光参量振荡器（OPO）作光源，使用光程长达1 097m的怀特池，采用单探测器分时复用的探测方法，首次在吸收池中精确测量了实际大气中1.315 μm波长附近高分辨率吸收光谱，实验验证了实际大气中水汽是该波段的主要吸收气体；得到了实际大气中吸收分子在氧碘激光波长（7 603.14cm^-11）处的吸收截面为 (1.05±0.09)×10^-24 cm²(标准大气条件下）以及在该波段主要吸收谱线的参数，包括吸收线的位置、线强度、压力加宽半宽度等。利用实测的线参数计算了在氧碘激光波长附近大气分子的吸收截面，发现吸收最小的波长分别位于7 603.31和7 603.93cm^-1，其值约为(8.9±0.8)×10^-25 cm²，比氧碘激光波长处的吸收截面约小15%。

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.