Mechanical effects of light on the Ξ-type three-level atom in a high-finesse optical cavity

刘利伟,; 谭磊,; 黄刚,

doi:10.1088/1674-1056/20/1/014205

Chinese Phys. B

2011

DOI: 10.1088/1674-1056/20/1/014205

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Mechanical effects of light on the Ξ-type three-level atom in a high-finesse optical cavity

刘利伟刘利伟¹,

谭磊谭磊²,

黄刚黄刚³

Abstract: A theoretical study is carried out for the modification and implication of the effect on the Ξ-type three level atom in a high-finesse optical cavity driven by light field including spontaneous emission and the cavity decay. Analytic expressions for the dipole force, the friction force, the optical potentials and the friction coefficient are obtained. Then the numerical and graphical methods are used to investigate the friction coefficient with the controlling parameters. It is shown that the friction coeffici… Show more

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Cited by 2 publications

References 24 publications

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Structure evolvement of solid particles and mechano-chemical effect

Xu¹,

Lai-Qiang²,

Li³

2012

Acta Phys. Sin.

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Al ultra-fine grains are prepared by dry roller vibration milling at room temperature. After the ultrasonic hydrolyzing, the Al powders are milled for 2 h, 4 h and 8 h, separately, becoming the colloidal Al(OH)3. After the hydrolyzing production are dried, grinded, calcined, the flaky -Al2O3 nano-particles are obtained, and the particles sizes are in the range from 30 to 50 nm. By X ray diffraction (XRD) analysis method and transmission electron microscope (TEM), we analyze the energy conversion of solid particles in the vibration milling, and study the relation between the structure evolvement of solid particles and mechano-chemical reaction, in order to ascertain ideal milling time. The research results indicate that the solid particles under the action of mechanical force generate a mass of deformation and dislocation flaws and the material is in metastable high-energy state, which is favorable for inducing mechano-chemical reaction. In certain conditions, the surface energy of crystalloid, strain and dislocation energy could be mutually converted. The odds of lattice distortion and dislocation are maximal for the 2 h-milled Al powders, so the material shows a higher chemical reaction activation. On the ultrasonic agitation, the energy is fully released from the material interior, then Al(OH)3 nano-particles are prepared in a short time.

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Structure evolvement of solid particles and mechano-chemical effect

Xu¹,

Lai-Qiang²,

Li³

2012

Acta Phys. Sin.

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Precision measurement of single-atom trajectories in higher-order Laguerre-Gaussian transverse modes of a Fabry-Perot cavity

王延娜¹,

赵迪²,

方爱平³

et al. 2015

Acta Phys. Sin.

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A coupled quantum system composed of cavity field and atoms is one of the main research contents of cavity quantum electrodynamics. It can be used to realize single atom manipulation and measurement, and has important significance for studying the interaction between light and the atom, preparing quantum states and quantum entanglement. Current research work mainly focuses on two aspects. One is to achieve the atom trapping via the feedback control of the trapping laser intensity. The other is to measure the single atomic motion in a Fabry-Perot cavity by using Hermite-Gaussian transverse modes. The detection of the atomic trajectories has been realized via the observation of transmission spectra of the strong coupling system composed of cold atoms and Hermite-Gaussian transverse modes in a Fabry-Perot cavity. In order to observe the atomic motion trajectories in the cavity, we theoretically study the transmission spectrum of a strong coupling system composed of cold atoms and Laguerre-Gaussian transverse modes in a Fabry-Perot cavity in this paper. We calculate the relationship between the coupling coefficient and the mode number of Laguerre-Gaussian transverse modes. The result shows that with the increase of Laguerre-Gaussian transverse mode number, the maximum coupling coefficient between the atoms and cavity fields is almost unchanged, so the contrast of the detected spectrum is nearly independent of the mode number. Analysis shows that Laguerre-Gaussian transverse mode provides more abundant information about atomic motion trajectory than Hermite-Gaussian transverse mode. The field distribution of Laguerre-Gaussian transverse mode is ring-shaped. Owing to the ring shape, the atoms dropped at different positions experience different electric field intensities, and the detected transmission spectra are changed. Therefore, we can implement the high precision distinguishment of the atomic trajectories by observing the features of the transmission spectra such as the number of the transmission peaks and their positions. Furthermore, a small deviation of the atomic motion trajectories, on the edges of the rings of the electric field, may induce great change in transmission spectrum, and then we can very accurately detect the atomic motion around these positions.

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Mechanical effects of light on the Ξ-type three-level atom in a high-finesse optical cavity

Cited by 2 publications

References 24 publications

Structure evolvement of solid particles and mechano-chemical effect

Structure evolvement of solid particles and mechano-chemical effect

Precision measurement of single-atom trajectories in higher-order Laguerre-Gaussian transverse modes of a Fabry-Perot cavity

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