Strong-field two-photon absorption in atomic cesium: an analytical control approach.
We have considered an analytical control of two-photon absorption process of atoms in the strong-field interaction regime. The experiment was performed on gaseous cesium atoms strongly interacting with a shaped laser-pulse from a femtosecond laser amplifier and a programmable pulse-shaper. When this shaped laser-pulse transfers the atomic population from the 6s ground state to the 8s excited state, we have found that both positively- and negatively-chirped laser pulses, compared with a Gaussian pulse, enhance this excitation in the strong-field regime of laser-atom interaction. This unusual phenomena is explained because the temporal shape of the laser intensity compensates the effect of dynamic Stark shift for the two-photon resonant condition to be optimally maintained. We provide analytic calculations using the strong-field phase matching, which show good agreement with the experiment.
Lee
Sangkyung
S
Department of Physics, KAIST, Daejeon 305-701, South Korea.
Lim
Jongseok
J
Ahn
Jaewook
J
D002586:Cesium / Q000737:chemistry*; D003198:Computer Simulation; D008027:Light; D008956:Models, Chemical; D017785:Photons; D012542:Scattering, Radiation
D002586:Cesium