Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Journal of Experimental and Theoretical Physics

Nonlinear Doppler-free narrow resonances in optical transitions and annihilation radiation of positronium

Vladilen S Letokhov, Vladimir G. Minogin

Published Jul 1, 1976• 0 citations
OpenAlex

Related papers

The role of coherent radiation and an active medium in the annihilation of positrons and the formation of excited positronium atoms

V. J. Goldanskii, Fedor I Dalidchik, G. K. Ivanov

Applied Physics A•Oct 1, 1974•0 citations

Annihilation of positronium atoms in an oscillatory field

R. Kh. Sabirov

Russian Physics Journal•Mar 1, 1989•0 citations

Sub-Doppler Resonances in Free Polarization Decay in Ultrathin Gas Cells

А. Ч. Измайлов

Abstract The nonlinear optical effect of free polarization decay (FPD) in an ultrathin gas cell, the inner thickness of which is less than or on the order of the wavelength of the exciting monochromatic laser radiation propagating orthogonally to the plane-parallel walls of this cell, is studied theoretically. The considered coherent FPD signal is emitted immediately after abrupt termination of this comparatively weak stationary radiation. The sub-Doppler resonances appearing at the central frequencies of the studied quantum transitions in the FPD intensity and energy spectra due to the transit-time relaxation of atoms in the gas cell are detected and studied. It is shown that these resonances and the FPD dynamics strongly depend on the ratio between the inner thickness of the gas cell and the wavelength of the exciting monochromatic radiation. The narrow high–contrast sub-Doppler resonances of FPD observed and studied in a linear optical regime can be used in atomic (molecular) high-resolution spectroscopy and as references for compact frequency standards.

Optics and Spectroscopy•Jan 1, 2021•0 citations

Annihilation superradiance in system of positronium atoms

R. A. Vlasov, O. N. Gadomskiĭ, M. G. Shageev

SPhD•Apr 1, 1990•0 citations

Parapositronium atom in the field of annihilation and optical photons as a nonlinear quantum system

Oleg N. Gadomsky, T. T. Idiatullov, Yu. V. Abramov

The problem of the interaction of a positronium atom with the field of optical and annihilation photons is considered. The solution obtained for the occupation numbers is used to study kinetics of the annihilation decay of para-positronium atom from two states participating in stimulated optical transitions excited by a laser. It is shown that a non- exponential time dependence of the occupation numbers is observed under the conditions of a nonlinear coherent interaction of a positronium atom with the field of optical and annihilation photons, and in some cases there is a possibility of appearance of a long-lived state of a positronium atom with a lifetime hundreds of times longer than the lifetime of a positronium atom in the 1S state.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Jan 14, 2000•0 citations

Narrow Resonances of Two-Photon Transitions Without Doppler Broadening

Vladilen S Letokhov, Veniamin P. Chebotayev

Springer series in optical sciences/SPringer series in optical sciences•Jan 1, 1977•1 citation
Abstract The nonlinear optical effect of free polarization decay (FPD) in an ultrathin gas cell, the inner thickness of which is less than or on the order of the wavelength of the exciting monochromatic laser radiation propagating orthogonally to the plane-parallel walls of this cell, is studied theoretically. The considered coherent FPD signal is emitted immediately after abrupt termination of this comparatively weak stationary radiation. The sub-Doppler resonances appearing at the central frequencies of the studied quantum transitions in the FPD intensity and energy spectra due to the transit-time relaxation of atoms in the gas cell are detected and studied. It is shown that these resonances and the FPD dynamics strongly depend on the ratio between the inner thickness of the gas cell and the wavelength of the exciting monochromatic radiation. The narrow high–contrast sub-Doppler resonances of FPD observed and studied in a linear optical regime can be used in atomic (molecular) high-resolution spectroscopy and as references for compact frequency standards.
The problem of the interaction of a positronium atom with the field of optical and annihilation photons is considered. The solution obtained for the occupation numbers is used to study kinetics of the annihilation decay of para-positronium atom from two states participating in stimulated optical transitions excited by a laser. It is shown that a non- exponential time dependence of the occupation numbers is observed under the conditions of a nonlinear coherent interaction of a positronium atom with the field of optical and annihilation photons, and in some cases there is a possibility of appearance of a long-lived state of a positronium atom with a lifetime hundreds of times longer than the lifetime of a positronium atom in the 1S state.