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Photoelectron angular momentum distribution of He+ driven by a few-cyclelaser is investigated numerically. We simultaneously observe two dominantinterference patterns with one shot of lasers by solving the 3D time-dependentSchrodinger equation (TDSE). The analysis of a semiclassical model identifiesthese two interference patterns as two kinds of photoelectron holography. Theinterference pattern with Pz > 0 is a kind of forward rescattering holography,which comes from the interference between direct (reference) and rescattered(signal) forward electrons ionized in the same quarter-cycle. The interferencepattern with Pz < 0 is a kind of backward rescattering holography, which comesfrom the interference between direct electron ionized in the third quarter-cycle and rescattered backward electron ionized in the first quarter-cycle.Moreover, we propose a method to distinguish this backward rescatteringholography and intracycle interference patterns of direct electrons. This is animportant step for dynamic imaging of molecular structure and detectingelectron in molecules on attosecond time scale by the backward rescatteringattosecond photonelectron holography.

Simultaneous observation of forward-backward attosecond photoelectron holography