Brown M S, Rahn L A, Dreier T
Opt Lett. 1992 Jan 1;17(1):76-8. doi: 10.1364/ol.17.000076.
High-resolution degenerate four-wave mixing spectra of the R(1)(9) A(2)Sigma(+) ? X(2)II(0,0) transition of OH have been measured in a hydrogen/oxygen flame at atmospheric pressure where the Doppler and homogeneous linewidths are of comparable magnitude. The observed sub-Lorentzian Doppler-free line profile is fit well by existing perturbative models by using homogeneous broadening consistent with two-photon absorption measurements. Power broadening of the spectral profile with increasing pump-beam intensity was observed and is compared with predictions from a nonperturbative two-level model.
在大气压下的氢/氧火焰中，测量了OH的R(1)(9) A(2)Σ⁺ ← X(2)Ⅱ(0,0)跃迁的高分辨率简并四波混频光谱，其中多普勒线宽和均匀线宽大小相当。通过使用与双光子吸收测量一致的均匀展宽，现有的微扰模型很好地拟合了观测到的亚洛伦兹无多普勒线轮廓。观察到随着泵浦光束强度增加光谱轮廓的功率展宽，并与非微扰二能级模型的预测进行了比较。
