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Springer eBooks

The Multiphoton Coherent Hanle Effect

Allen M. Flusberg, THOMAS W. MOSSBERG, Sven R. Hartmann

Published Jan 1, 1978• 2 citations
Publisher
DOI
10.1007/978-1-4757-0665-9_73

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Role of transfer of coherence in the enhanced absorption Hanle effect with two optical fields

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The enhanced absorption Hanle effect has been studied for a closed transition Jg = 2 → Je = 3 with a transverse magnetic field in the presence of a coupling optical field. From an analysis of the individual probe and coupling field absorption profiles, it is shown that the Hanle electromagnetically induced absorption is governed by the transfer of Δm = ±2 and Δm = ±1 Zeeman coherences from the excited state to the ground state via spontaneous emission. The individual coherence contributions are governed by the intensity ratio of the optical fields. We show by computation and experiment that the magnetic field dependence of the forward scattered intensity can be used to distinguish the transfer of coherence contributions to the Hanle profile.

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Peculiar Signal in the Hanle Effect Experiments on the 6p01 Level of Xenon

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The Hanle effect was studied on the xenon 6 p 01 level by using a xenon laser at 3.99 µm (5 d 00 -6 p 01 ) and fluorescences of 979.9 nm (6 p 01 -6 s 12 ) and 1083.8 nm (6 p 01 -6 s 12 ) transitions. In addition to the intensity variation due to the Hanle signal and Doppler profile, a peculiar signal was observed which had a width of about twenty times the Hanle width of the 6 p 01 level. This signal is found to be independent of the coherence among the Zeeman sublevels of the 6 p 01 level.

Journal of the Physical Society of Japan•Jan 1, 1978•0 citations

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A laser resonant scattering process involves two steps, excitation and emission. That emission occurs spontaneously is well accepted. That the atoms involved in the emission are excited coherently by a laser beam leading to a non-isotropic angular distribution of emission (an antenna pattern) is not well known. The difference between coherent and incoherent excitation leads to the Hanle effect. In this paper, I discuss the physics of Hanle effect, and its influences on the backward scattering intensity of Na, K, and Fe atomic transitions and the associated Na and Fe resonant fluorescence lidar systems.

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Theory of Multiphoton Processes

Farhad H. M. Faisal, A. Dalgarno

Physics Today•Mar 1, 1989•0 citations
The enhanced absorption Hanle effect has been studied for a closed transition Jg = 2 → Je = 3 with a transverse magnetic field in the presence of a coupling optical field. From an analysis of the individual probe and coupling field absorption profiles, it is shown that the Hanle electromagnetically induced absorption is governed by the transfer of Δm = ±2 and Δm = ±1 Zeeman coherences from the excited state to the ground state via spontaneous emission. The individual coherence contributions are governed by the intensity ratio of the optical fields. We show by computation and experiment that the magnetic field dependence of the forward scattered intensity can be used to distinguish the transfer of coherence contributions to the Hanle profile.
A laser resonant scattering process involves two steps, excitation and emission. That emission occurs spontaneously is well accepted. That the atoms involved in the emission are excited coherently by a laser beam leading to a non-isotropic angular distribution of emission (an antenna pattern) is not well known. The difference between coherent and incoherent excitation leads to the Hanle effect. In this paper, I discuss the physics of Hanle effect, and its influences on the backward scattering intensity of Na, K, and Fe atomic transitions and the associated Na and Fe resonant fluorescence lidar systems.