Abstract
Two-photon ionization cross sections from the rubidium ground state have been measured with both a cw 421-nm laser and a combination of cw 421- and 1002-nm lasers. The measurements were performed within a high-vacuum magneto-optical trap while the trapping lasers were switched off, exploiting the long trap lifetime and also the trap laser confinement. The two-photon cross sections were determined for the blue laser near resonance with the and states and compared with the estimates of a theoretical model. In near resonance with the states, large two-photon photoionization cross sections were measured.
© 2004 Optical Society of America
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