Physical Review A
Experimental investigation on the frequency dependence of the exponential index in the Na 3s-5stwo-photon transition
Sung Ho Kim, Hong Jin Kong
Abstract
The exponential index K in the Na 3s-5s two-photon transition as a function of detuning in the range from -186 to 172 GHz was experimentally investigated. The value of the K index varies from 2.0 to 1.6 and from 1.9 to 0.41 for the pumping intensities of 3.5 and 14 MW/${\mathrm{cm}}^{2}$, respectively; they agree well with the theoretical prediction obtained from the optical Bloch equations.