摘要
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 0 97m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 .31 5 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 ( 76 0 3.1 4 cm-1)处的吸收截面为 ( 1 .0 5± 0 .0 9)× 1 0 -2 4 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 76 0 3.31和 76 0 3.93cm-1,其值约为( 8.9± 0 .8)× 1 0 -2 5cm2 ,比氧碘激光波长处的吸收截面约小 1 5 %
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.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2002年第1期35-40,共6页
High Power Laser and Particle Beams
基金
国家 8 6 3激光技术领域资助课题 ( 86 3-4 10 -6 )
