Ultimate capabilities for few-cycle pulse formation via resonant interaction of XUV radiation with IR-field-dressed atoms
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© 2017 American Physical Society. We perform an ab initio study of the ultimate capabilities and limits of applicability of the method for few-cycle pulse formation via the resonant interaction of extreme ultraviolet (XUV) radiation with atoms dressed by a moderately strong infrared (IR) laser field proposed in two earlier works [Y. V. Radeonychev, Phys. Rev. Lett. 105, 183902 (2010)10.1103/PhysRevLett.105.183902 and V. A. Polovinkin, Opt. Lett. 36, 2296 (2011)10.1364/OL.36.002296]. Taking into account all the multiphoton processes in the systems under consideration on the basis of numerical solution of the three-dimensional time-dependent Schrödinger equation (TDSE) in the single-active-electron approximation, we show the possibilities to produce 1.1-fs pulses from 124.6-nm XUV radiation via the linear Stark effect in atomic hydrogen, as well as 500-as pulses from 58.4-nm XUV radiation via excited-state ionization in helium. We derive a generalized analytical solution, which takes into account the interplay between sub-laser-cycle Stark effect and excited-state ionization and allows us to analyze the results of TDSE calculations. We found that the ultimate intensity of the IR field suitable for few-cycle pulse formation via the linear Stark effect or excited-state ionization is limited by the threshold for atomic ionization from the resonant excited state or the ground state, respectively. We show that the pulses with shorter duration can be produced in the medium of ions with higher values of the ionization potential.
author list (cited authors)
Akhmedzhanov, T. R., Emelin, M. Y., Antonov, V. A., Radeonychev, Y. V., Ryabikin, M. Y., & Kocharovskaya, O
complete list of authors
Akhmedzhanov, TR||Emelin, M Yu||Antonov, VA||Radeonychev, YV||Ryabikin, M Yu||Kocharovskaya, Olga