Abstract
Bichromatic polarization-shaped femtosecond laser pulses are used to control three-dimensional photoelectron momentum distributions (3D-EDs) from resonance enhanced multi-photon ionization of potassium atoms. The light fields consisting of two spectral bands with different ellipticity are produced using an ultrafast polarization pulse shaper equipped with a custom polarizer in the Fourier plane. The tomographically reconstructed 3D-EDs from ionization with counterrotating circularly or orthogonal linearly polarized bichromatic laser pulses show different angular momentum superposition states at four distinct photoelectron energies. The analysis of the measured 3D-EDs reveals that the underlying physical mechanism is based on the interplay of ionization pathway selection via quantum mechanical selection rules for optical transitions and intrapulse frequency mixing of the spectral bands with different ellipticity.
Highlights
Femtosecond polarization pulse shaping [1,2,3,4,5] is an established experimental technique which provides access to the spatial nature of the light–matter interaction by control of the instantaneous ellipticity of the laser pulse
We presented the first application of shaper-based polarization-tailored bichromatic femtosecond laser fields to the generation of controlled 3D free electron wave packets
We reported on control of 3D-EDs from resonance enhanced multi-photon ionization (REMPI) of potassium atoms by counterrotating circularly polarized (CNR-CP) and orthogonal linearly polarized (O-LP) bichromatic laser pulses
Summary
Bichromatic polarization-shaped femtosecond laser pulses are used to control three-dimensional. Any further distribution of photoelectron momentum distributions (3D-EDs) from resonance enhanced multi-photon ionizthis work must maintain attribution to the ation of potassium atoms. The light fields consisting of two spectral bands with different ellipticity are author(s) and the title of the work, journal citation produced using an ultrafast polarization pulse shaper equipped with a custom polarizer in the Fourier and DOI. The tomographically reconstructed 3D-EDs from ionization with counterrotating circularly or orthogonal linearly polarized bichromatic laser pulses show different angular momentum superposition states at four distinct photoelectron energies. The analysis of the measured 3D-EDs reveals that the underlying physical mechanism is based on the interplay of ionization pathway selection via quantum mechanical selection rules for optical transitions and intrapulse frequency mixing of the spectral bands with different ellipticity
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