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We demonstrate control over the localization of high-lying Rydberg wavepackets in argon atoms with phase-locked orthogonally polarized two-color (OTC)laser fields. With a reaction microscope, we measured ionization signals ofhigh-lying Rydberg states induced by a weak dc field and black-body radiationas a function of the relative phase between the two-color fields. We find thatthe dc-field ionization yields of high-lying Rydberg argon atoms oscillate withthe relative two-color phase with a period of $2\pi$ while the photoionizationsignal by black-body radiation shows a period of $\pi$. These observations area clear signature of the asymmetric localization of electrons recaptured intohigh-lying Rydberg states after conclusion of the laser pulse and are supportedby a semiclassical simulation of argon-OTC laser interaction. Our findings thusopen an effective pathway to control the localization of high-lying Rydbergwave packets.

Localizing High-Lying Rydberg Wave Packets with Two-Color Laser Fields