【摘要】 本文报道了用一个火花隙同时能发两台独立调谐的染料激光器（复合腔式、闪光灯泵浦）实现对钠原子（3S-3P-4D）三步共振饱和光电离,并对饱和跃迁情况下的系统速率方程进行了近似的解析解,与实验测得的电离曲线很好地符合,同时测量了电离激光束波长为5890A时的4D态电离截面,σ_4D=（1.2±0.4）×10^-18cm²,并进行了电离截面的理论估计,与实验值较好地符合。更多还原

【Abstract】 Synchronized by being triggered with the same spark gap, two independently tunable flashlamp-pumped dye lasers with compound cavity structure were used to obtain saturated doubly resonant (3S-3P-4D) three-photon ionization of sodium. Eate equations of such a system under the condition of saturated transitions were analytically solved. Comparison of the calculated ionization curve with experimental results gave good correspondence. The ionization cross section of sodium 4D state has been measured from the curve at laser wavelength 6890A, σ4D(5890A)= (1.2±#0.4)×10-18cm2. It is in good agreement with the theoretical calculation, which is also given in this article.更多还原