The effect of Doppler broadening on dispersive and absorptive properties in atomic systems with two-photon interference

2011 ◽  
Vol 284 (24) ◽  
pp. 5697-5701 ◽  
Author(s):  
Lida Zhang ◽  
Fengxue Zhou ◽  
Yueping Niu ◽  
Jingtao Zhang ◽  
Shangqing Gong
Keyword(s):  
Doppler Broadening ◽  
Atomic Systems ◽  
Two Photon

The two-photon approximation for the four-photon decay of the 4d excited state in hydrogenThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at École de Physique, les Houches, France, 30 May – 4 June, 2010.

2011 ◽  
Vol 89 (1) ◽  
pp. 123-127 ◽  
Author(s):  
D. Solovyev ◽  
L. Labzowsky
Keyword(s):  
Excited State ◽  
Hydrogen Atom ◽  
Early Universe ◽  
Recombination Process ◽  
Atomic Systems ◽  
International Conference ◽  
Two Photon ◽  
Photon Decay ◽  
Hydrogen Recombination ◽  
History Of

The method of two-photon approximation for multiphoton decay is applied to the decay of the 4d state in the hydrogen atom. In the process of four-photon decay the two-photon contribution that leads to radiation escape, from the interaction with matter, is considered. This may be helpful for a strict description of the recombination process in the hydrogen atom and, in principle, for the history of hydrogen recombination in the early universe.

scholarly journals Continuous Lyman-alpha generation by four-wave mixing in mercury for laser cooling of antihydrogenThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at École de Physique, les Houches, France, 30 May – 4 June, 2010.

2011 ◽  
Vol 89 (1) ◽  
pp. 25-28 ◽  
Author(s):  
D. Kolbe ◽  
A. Beczkowiak ◽  
T. Diehl ◽  
A. Koglbauer ◽  
A. Müllers ◽  
...  
Keyword(s):  
Laser Cooling ◽  
Continuous Wave ◽  
Four Wave Mixing ◽  
Gravitational Acceleration ◽  
Wave Mixing ◽  
Mixing Process ◽  
Cpt Symmetry ◽  
Atomic Systems ◽  
Lyman Alpha ◽  
Two Photon

Cooling antihydrogen atoms is important for future experiments both to test the fundamental CPT symmetry by high resolution laser spectroscopy and also to measure the gravitational acceleration of antimatter. Laser cooling of antihydrogen can be done on the strong 1S–2P transition at the wavelength of Lyman-alpha (121.6 nm). A continuous wave laser at the Lyman-alpha wavelength based on solid-state fundamental lasers is described. By using a two-photon and a near one-photon resonance a scan across the whole phase matching curve of the four-wave mixing process is possible. Furthermore the influence of the beam profile of one fundamental beam on the four-wave mixing process is studied.

scholarly journals Semiclassical approach to the line shapeThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at École de Physique, les Houches, France, 30 May – 4 June, 2010.

2011 ◽  
Vol 89 (1) ◽  
pp. 135-140
Author(s):  
M. N. Stoilov
Keyword(s):  
Electric Dipole ◽  
Electric Dipole Transition ◽  
Dipole Transition ◽  
Antiprotonic Helium ◽  
Transition Line ◽  
Semiclassical Approach ◽  
Atomic Systems ◽  
Two Photon ◽  
Gas Target ◽  
Helium Gas

We extend the results of Bakalov et al. (Phys. Rev. Lett. 84, 2350 (2000)) on one-photon electric dipole transition line shift and broadening to the case of two-photon transitions. As an example, we consider the laser-induced transition in antiprotonic helium produced in a helium gas target. The transition is between antiprotonic helium states (n, l) = (33, 32) and (31, 30).

scholarly journals Nonlinear Dynamics of a Cavity Containing a Two-Mode Coherent Field Interacting with Two-Level Atomic Systems

2020 ◽  
Vol 10 (20) ◽  
pp. 7150
Author(s):  
E. M. Khalil ◽  
Hashim M. Alshehri ◽  
A.-B. A. Mohamed ◽  
S. Abdel-Khalek ◽  
A.-S. F. Obada
Keyword(s):  
Quantum Coherence ◽  
Intrinsic Noise ◽  
Noise Model ◽  
Atomic Systems ◽  
Dipole Coupling ◽  
Two Photon ◽  
Dipole Interactions ◽  
Coherent Field ◽  
Noise Rate ◽  
Sudden Appearance

This study analytically explored two coupled two-level atomic systems (TLAS) as two qubits interacting with two modes of an electromagnetic field (EMF) cavity via two-photon transitions in the presence of dipole–dipole interactions between the atoms and intrinsic damping. Using special unitary su(1,1) Lie algebra, the general solution of an intrinsic noise model is obtained when an EMF is initially in a generalized coherent state. We investigated the population inversion of two TLAS and the generated quantum coherence of some partitions (including the EMF, two TLAS, and TLAS–EMF). It is possible to generate quantum coherence (mixedness and entanglement) from the initial pure state. The robustness of the quantum coherence produced and the sudden appearance and disappearance of coherence depended not only on dipole–dipole coupling but also on the intrinsic noise rate. The growth of mixedness and entanglement may be enhanced by increasing dipole–dipole coupling, leading to more robustness against intrinsic noise.

TWO-PHOTON LASER SPECTROSCOPY OF ANTIPROTONIC HELIUM

2013 ◽  
Vol 22 (09) ◽  
pp. 1330024
Author(s):  
MASAKI HORI
Keyword(s):  
Laser Spectroscopy ◽  
Quantum Electrodynamics ◽  
Spectral Lines ◽  
Antiprotonic Helium ◽  
Electron Mass ◽  
Doppler Broadening ◽  
Mass Ratio ◽  
Helium Atoms ◽  
Two Photon ◽  
Three Body

The ASACUSA collaboration of CERN has recently carried out two-photon laser spectroscopy of antiprotonic helium atoms. Some nonlinear two-photon transitions of the antiproton at the deep UV wavelengths λ = 139.8–197.0 nm were excited by irradiating the atom with two counterpropagating laser beams. This reduced the thermal Doppler broadening in the observed spectral lines. Three transition frequencies were thus determined with fractional precisions of 2.3–5 parts in 109. By comparing the results with three-body quantum electrodynamics calculations, the antiproton-to-electron mass ratio was derived as 1836.1526736(23). In this paper, we briefly review these recent experimental results.

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