On the polarization aspects of attosecond interferometry at mixing states of different parity

Yudin S.N., Popova M.M., Grum-Grzhimailo A.N., Gryzlova E.V.

For Russian citation (Opticheskii Zhurnal):

Юдин С.Н., Попова М.М., Грум-Гржимайло А.Н., Грызлова Е.В. Поляризационные аспекты аттосекундной интероферометрии при смешивании состояний различной чётности // Оптический журнал. 2026. Т. 93. № 8. С. 5–16. http://doi.org/10.17586/1023-5086-2026-93-08-05-16

Yudin S.N.,Popova M.M., Grum-Grzhimailo A.N., Gryzlova E.V. On the polarization aspects of attosecond interferometry at mixing states of different parity [in Russian] // Opticheskii Zhurnal. 2026. V. 93. № 8. P. 5–16. http://doi.org/10.17586/1023-5086-2026-93-08-05-16

For citation (Journal of Optical Technology):

Abstract:

Subject of study. Quantum control of photoemission is based on the induction of several transition paths to a chosen energy state with the help of polychromatic field with proportional frequencies. In this paper, we consider bichromatic ionization by the field of the fundamental and doubled harmonics (w + 2w) and polychromatic one by multiple harmonics spaced by the tripled frequency of the seed (w + 3mw). In these cases, channels of different parity are mixed at the same energy, and the modulation of the phase difference between harmonics is manifested in a variation of the angular distribution of photoemission. The aim of this work. A theoretical study of the interference of channels of different parity in bichromatic and polychromatic ionization schemes, manifested in differential angular characteristics, and an analysis of the symmetry of photoemission for various polarization geometries. Method. In the current study, we apply the angular momentum algebra method in combination with the solution of the nonstationary Schrodinger equation and nonstationary perturbation theory. Main results. we study the symmetries of the angular distribution for six polarization geometries, which, in the absence of coherence, would have the highest symmetry: fields linearly polarized in the same and perpendicular directions; fields propagating in the same direction with circular polarization of the same or opposite helicities; one field with circular polarization, and the second — linearly polarized in the direction of the first field propagation. It is shown that the geometry in which the seed field is linearly polarized and the multiple possesses a circular polarization is optimal for extraction the phases of the fields. Practical significance. The developed theory allows for more accurate determination of laser pulse characteristics.

Keywords:

coherent control, polarization of radiation, photoemission, angular distribution of photoelectrons, helium atom

Acknowledgements:

the theoretical part of the study (deriving expressions for angular anisotropy parameters in terms of reduced amplitudes using angular momentum algebra methods, and determining the symmetry types characteristic of various field geometries) was conducted under the state assignment of Lomonosov Moscow State University. The numerical part of the study (calculating the transition matrix elements in MCHF (multiconfiguration Hartree-Fock), obtaining specific values for the angular anisotropy parameters, and constructing photoelectron angular distributions) was funded by the Russian Science Foundation, Grant № 25-72-10172, https://rscf.ru/project/25-72-10172/.

OCIS codes: 270.1670, 270.4180

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