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Indian Journal of Physics

Resolution enhancement of photoelectron spectra by coherent phase control

Yanyan Huang, Shuwu Xu, Xiaoting Ji, Xiaohua Yang

Published Mar 13, 2013• 2 citations
Publisher
DOI
10.1007/s12648-013-0273-9

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In this paper, we theoretically demonstrate that the (2+1+1) resonance enhanced multi-photon ionization photoelectron spectroscopy in sodium atom can be effectively controlled by shaping femtosecond laser pulse with a π phase step modulation in weak laser field, involving its total photoelectron energy, maximal photoelectron intensity, and spectroscopic bandwidth. Our results show that the total photoelectron energy can be suppressed but not enhanced, the maximal photoelectron intensity can be enhanced and also suppressed, and the photoelectron spectroscopy can be tremendously narrowed. These theoretical results can provide a feasible scheme to achieve the high-resolution photoelectron spectroscopy and study the excited state structure in atomic and molecular systems.
Properties of the two-photon ionization photoelectron spectra in excitation-ionization scheme by frequency-modulated fields are studied by means of perturbation theory and numerical calculation method.The influences on the photoelectron spectra by the modulated amplitude,the modulated frequency,and the initial phase of the frequency-modulated field and the detuning are discussed under strong-field mechanism.It is shown that the photoelectron spectra can be modulated by the modulated amplitude,the modulated frequency,the initial phase and the detuning.Quantum control of the photoelectron spectra can be realized by those parameters.Mechanism of quantum coherent control in this system is monitoring the selective population of dressed states(SPODS).
The properties of the photoelectron spectra in two resonant multi-photon ionization process are studied by means of dressed state theory and perturbation theory.The influences on the photoelectron spectra by the area of the first pulse and the delay between two pulses are discussed under strong-field scheme.It is shown that the photoelectron spectra can be modulated by the areas of the two pulses and the delay between them.Control of Autler-Townes doublet and the interferences in doublet can be realized by the area of the first pulse and the delay between the two pulses.The selective population of dressed states(SPODS)also can be realized by this coherent quantum mechanism.The population of dressed states cannot be selected by the area of the second pulse,but obviously it can be modulated.