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Physical Review Letters

Spin Manipulation Using the Light-Shift Effect in Rubidium Atoms

T. Moriyasu, D. Nomoto, Yuka Koyama, Yukio Fukuda, T. Kohmoto

Published Nov 17, 2009• 24 citations
Publisher

Abstract

Optical manipulation of spin coherence in rubidium atoms is studied. The effect of off-resonant and circularly polarized light on optically induced magnetization is investigated. The change in precession frequency caused by the light-shift effect is verified. Absorption-free phase control of spin precession and pure spin rotation about an arbitrary axis are demonstrated. A theory of precession frequency shift that includes the effect of absorption is considered by using the density matrix and the experimental results are in agreement with the predictions of the theory. Thus, we show that it is possible to carry out off-resonant control of spin coherence and all-optical manipulation of spins.

DOI
10.1103/physrevlett.103.213602

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Optical manipulation of spin coherence in rubidium atoms is studied. The effect of off-resonant and circularly polarized light on optically induced magnetization is investigated. The change in precession frequency caused by the light-shift effect is verified. Absorption-free phase control of spin precession and pure spin rotation about an arbitrary axis are demonstrated. A theory of precession frequency shift that includes the effect of absorption is considered by using the density matrix and the experimental results are in agreement with the predictions of the theory. Thus, we show that it is possible to carry out off-resonant control of spin coherence and all-optical manipulation of spins.
We studied the optical manipulation of spin coherence in rubidium atoms by using polarization spectroscopy with the pump-probe technique.Two types of optically induced spin echoes, namely on-and off-resonant manipulations, whose creation mechanism are the optical pumping effect and the light shift effect, respectively, are studied theoretically and experimentally.A theory of optically induced spin echoes that can be applied to both types of spin echoes is considered by using the density matrix, and a general expression for the refocusing efficiency of the control pulse is presented.The effect of the off-resonant manipulation was examined by using light pulses of two frequencies provided by two lasers.Vector models for the two types of spin echoes are presented, and the observed dependences of the frequency and the duration of the control pulse on the spin-echo intensity are suitably explained by the theoretically derived refocusing efficiency.The off-resonant manipulation gives the possibility of arbitrary-angle spin rotation around an arbitrary axis.
We studied the optical manipulation of spin coherence in rubidium atoms by using polarization spectroscopy with the pump-probe technique. Two types of optically induced spin echoes, namely on- and off-resonant manipulations, whose creation mechanism are the optical pumping effect and the light shift effect, respectively, are studied theoretically and experimentally. A theory of optically induced spin echoes that can be applied to both types of spin echoes is considered by using the density matrix, and a general expression for the refocusing efficiency of the control pulse is presented. The effect of the off-resonant manipulation was examined by using light pulses of two frequencies provided by two lasers. Vector models for the two types of spin echoes are presented, and the observed dependences of the frequency and the duration of the control pulse on the spin-echo intensity are suitably explained by the theoretically derived refocusing efficiency. The off-resonant manipulation gives the possibility of arbitrary-angle spin rotation around an arbitrary axis.
We demonstrate an experimental scheme for studying the light shift effect in an optical magnetic double resonance system by using 4 He atoms. The dependences of the light shift caused by left- and right-circularly polarized laser light, respectively with laser frequency detuning and laser power are investigated, which show good agreement with theoretical analysis. Based on these, the above parameters are optimized in order to reduce light shift effect for a typical optical magnetic double resonance system.