2019/12/06 by Hicham Agueny, Agueny, Hicham
Physics and Astronomy · #Advanced Fiber Laser Technologies #Atomic Physics (physics.atom-ph) #FOS: Physical sciences #Laser-Matter Interactions and Applications #Optics (physics.optics) #Quantum Physics (quant-ph) #Spectroscopy and Quantum Chemical Studies
paper · pdf · doi:10.48550/arxiv.1912.06553
openalex publication_date 2019/12/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study ultrafast ionization dynamics using orthogonally polarized two-color\n(OTC) laser pulses involving the resonant "first plus second"\n(\ω+2\ω) scheme. The scheme is illustrated by numerical simulations\nof the time-dependent Schr "odinger equation and recording the photoelectron\nmomentum distribution. On the basis of the simulations of this resonant\nionization, we identify signatures of the dynamic Autler-Townes effect and\ndynamic interference, in which their characterization is not possible in\nspectral domain. Taking advantage of the OTC scheme we show that these\ndynamical effects, which occur at the same time scale, can be characterized in\nmomentum space by controlling the spatial quantum interference. In particular,\nwe show that with the use of this control scheme, one can tailor the properties\nof the control pulse to lead to enhancement of the ionization rate through the\nAutler-Townes effect without affecting the dynamic interference. This\nenhancement is shown to result from constructive interferences between partial\nphotoelectron waves having opposite-parity, and found to manifest by\nsymmetry-breaking of the momentum distribution. The scenario is investigated\nfor a prototype of a hydrogen atom and is broadly applicable to other systems.\nOur findings may have applications for photoelectron interferometers to control\nthe electron dynamics in time and space, and for accurate temporal\ncharacterization of attosecond pulses.\n