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Physical Review A

Propagation dynamics in an autoionization medium

Emmanuel Paspalakis, Niels J. Kylstra, P. L. Knight

Published Jul 1, 1999• 31 citations
Publisher

Abstract

We demonstrate that an autoionizing medium can, under specific conditions, become transparent to a short laser pulse propagating in the medium. The interference that leads to transparency is intrinsic to the system and relies on the establishment of a ``dark,'' or ``trapped,'' state that exists as a consequence of Fano interference between direct and resonant photoionization processes.

DOI
10.1103/physreva.60.642

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We demonstrate that an autoionizing medium can, under specific conditions, become transparent to a short laser pulse propagating in the medium. The interference that leads to transparency is intrinsic to the system and relies on the establishment of a dark,'' or trapped,'' state that exists as a consequence of Fano interference between direct and resonant photoionization processes.
We study the consequences of spontaneous emission interference in the propagation dynamics of a short laser pulse in a closed V\mathsf{V}V-type medium. We show that, under specific conditions, the (otherwise opaque) medium becomes transparent to the laser pulse. The influence of incoherent processes on the transparency is also investigated.
We discuss the propagation of a short laser pulse in an autoionizing medium with double Fano structure. By solving the coupled equations for atoms and fields simultaneously, we can consider the influence of double Fano structure on the pulse laser in the transmission process. Full Text: PDF References A. Raczynski, M. Rzepecka, J. Zaremba, and S. Zielinska-Kaniasty, Electromagnetically induced transparency and light slowdown for Λ-like systems with a structured continuum, Opt. Commun. 266, 552 (2006). CrossRef T. Bui Dinh, W. Leonski, V. Cao Long and J. Perina Jr, Electromagnetically induced transparency for a double Fano-profile system, Eur. Phys. J. D, 68 (2014) CrossRef T. Bui Dinh, W. Leonski, V. Cao Long and J. Perina Jr, Electromagnetically induced transparency in systems with degenerate autoionizing levels in Λ-configuration, Optica Applicata 43, 471 (2013). CrossRef Cao Long Van, Structured continuum in various optical phenomena, in Physics and applications I: Quantum Optics Ed. Wieslaw Leonski, University of Zielona Gora Press, p.195 (2012). DirectLink M. Shapiro, Electromagnetically induced transparency with structured multicontinua, Phys.Rev.A 75, 013424 (2007). CrossRef E. Paspalakis, P.L. Knight, Population transfer via an autoionizing state with temporally delayed chirped laser pulses, J. Phys. B 31, 2753 (1998). CrossRef S.Y. Zhu and E.E. Fill, Nonlinear theory of lasers without inversion with two upper lasing levels, Phys. Rev. A 42, 5684 (1990). CrossRef S. E. Harris, Lasers without inversion: Interference of lifetime-broadened resonances, Phys. Rev. A 62, 1033 (1989). CrossRef E. Paspalakis, N. J. Kylstra, and P. L. Knight, Propagation dynamics in an autoionization medium, Phys. Rev. A 60, 642 (1999). CrossRef W. Leonski, R. Tanaś and S. Kielich, Laser-induced autoionization from a double Fano system, J. Opt. Am. B 4, 72 (1987). CrossRef
We discuss the propagation of a short laser pulse in an autoionizing medium with double Fano structure. By solving the coupled equations for atoms and fields simultaneously, we can consider the influence of double Fano structure on the pulse laser in the transmission process. Full Text: PDF References A. Raczyński, M. Rzepecka, J. Zaremba, and S. Zielińska-Kaniasty, "Electromagnetically induced transparency and light slowdown for Λ-like systems with a structured continuum", Opt. Commun. 266, 552 (2006). CrossRef T. Bui Dinh, W. Leoński, V. Cao Long and J. Perina Jr, "Electromagnetically induced transparency for a double Fano-profile system", Eur. Phys. J. D, 68 (2014) CrossRef T. Bui Dinh, W. Leoński, V. Cao Long and J. Perina Jr, "Electromagnetically induced transparency in systems with degenerate autoionizing levels in Λ-configuration", Optica Applicata 43, 471 (2013). CrossRef Cao Long Van, Structured continuum in various optical phenomena, in Physics and applications I: Quantum Optics" Ed. Wiesław Leoński, University of Zielona Góra Press, p.195 (2012). DirectLink M. Shapiro, "Electromagnetically induced transparency with structured multicontinua", Phys.Rev.A 75, 013424 (2007). CrossRef E. Paspalakis, P.L. Knight, "Population transfer via an autoionizing state with temporally delayed chirped laser pulses", J. Phys. B 31, 2753 (1998). CrossRef S.Y. Zhu and E.E. Fill, "Nonlinear theory of lasers without inversion with two upper lasing levels", Phys. Rev. A 42, 5684 (1990). CrossRef S. E. Harris, "Lasers without inversion: Interference of lifetime-broadened resonances", Phys. Rev. A 62, 1033 (1989). CrossRef E. Paspalakis, N. J. Kylstra, and P. L. Knight, "Propagation dynamics in an autoionization medium", Phys. Rev. A 60, 642 (1999). CrossRef W. Leoński, R. Tanaś and S. Kielich, "Laser-induced autoionization from a double Fano system", J. Opt. Am. B 4, 72 (1987). CrossRef
Specific features of the propagation of light pulses with frequency lying in the range of autoionization resonances of the medium are analyzed. It is shown that the interference nature of the autoionization spectra makes it possible to combine a strong frequency dispersion of the refractive index with small absorption when the radiation frequency approaches the spectral range of the "transparency window" of an isolated resonance or of a series of overlapped autoionization resonances. This allows one to control the time delay of the pulses and their group velocity. Depending on the parameters of the medium, the pulse group velocity may be maximally reduced by a factor of 10 4 –10 5 .