We investigate electron momentum distributions from single ionization of Arby two orthogonally polarized laser pulses of different color. The two-colorscheme is used to experimentally control the interference between electron wavepackets released at different times within one laser cycle. This intracycleinterference pattern is typically hard to resolve in an experiment. With thetwo-color control scheme these features become the dominant contribution to theelectron momentum distribution. Furthermore the second color can be used forstreaking of the otherwise interfering wave packets establishing a which-waymarker. Our investigation shows that the visibility of the interference fringesdepends on the degree of the which-way information determined by thecontrollable phase between the two pulses.
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