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Theoretical Study of Novel Atom-optical Mirrors

Author: ZhengPing
Tutor: YinJianPing
School: Suzhou University
Course: Condensed Matter Physics
Keywords: Atom mirror Gaussian beam Elliptical Gaussian beam Flattened Gaussian beams Optical potential Gradient force The risk of spontaneous emission
CLC: O562
Type: Master's thesis
Year: 2003
Downloads: 35
Quote: 0
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Abstract


AC Stark effect, the role of light even neutral atoms in a non-uniform electromagnetic field will be strongly dipole proportional to the size of the induced dipole moment of the atom and the light field gradient. (Blue detuning) when the resonance frequency when the laser frequency is greater than the atomic transition, the atoms in the optical field is subject to a repulsive force, forcing the atoms away from the light field. This paper presents three implementations of the atoms of the atomic beam reflecting mirror new program: (1) semi-blue beam detuning Gaussian beam atoms reflector (2) semi-blue beam detuning elliptical Gaussian beam atomic reflector (3) semi- The the blue beam detuning level items Gaussian beam atomic mirror, detailed calculations of the spatial distribution of the diffraction field in the mirror, and discussed the moving atom in the light field suffered dipole. Firstly blue detuned Gaussian beam half-beam atomic mirror program to study the incident Gaussian beam Fresnel diffraction straight edge Kirchoff diffraction properties of semi-infinite opaque the tablet Dangqu half. Studies have shown that half blue beam detuned Gaussian beam diffraction field optical potential is much larger than the evanescent light field of the optical potential, in the same parameter conditions, the maximum speed of the incident atoms than fade away large light field, so as a novel atoms in the mirror, half-blue beam detuned Gaussian beams can be used to efficiently Act incident atom to speeds greater than 1m / s. However, because the the half blue beam detuning Gaussian beam diffraction field strength gradient force is much smaller than the evanescent wave field, so when the incident atom velocity, the chance to be spontaneous emission of the atoms in the half blue beam detuned Gaussian beam diffracted light field greater than the evanescent light field. When the major axis y in the direction of the beam waist size with a circular Gaussian beam waist relative to the elliptical Gaussian beam cross-sectional area is smaller. Thus, corresponding to the same incident power, the half beam elliptical Gaussian beam, the absolute light intensity I (x) than the circular Gaussian light beam is much more powerful. Take the same size when the Gaussian beam w_y beam waist w GB elliptical Gaussian beam w_x of gradually decreasing cross-sectional area of ??the elliptical Gaussian beam will be gradually smaller, and gradually increases its light forcing. Therefore, when the elliptical Gaussian beam to w_y = 10mm, the-w_xw from 10mn reduced to 1mm, half blue beam detuning elliptical Gaussian beam reflecting surface of the diffracted light intensity than the same parameters under the conditions of SGB reflecting surface diffraction light intensity 10 times. Obviously, using a semi-beam the blue detuning elliptical Gaussian beam as atoms reflection mirror, in the same reflector area, comparable the SGB mirror reflecting higher method to speed the incident atom beam. Similarly, the semi-blue beam detuning flattened Gaussian beam reflector and SGB reflector in a the yoz plane diffraction intensity gradient is approximately the same, under the same conditions which means that the incident light beam parameters, the reflection the optical dipole repulsion by the mirror surface near the incident atom is approximately the same size. However, due to the flattened Gaussian light beam intensity distribution is a constant within a large range, it is compared with the SGB, semi beam flattened Gaussian beams blue detuning the lateral width of the mirror surface much wider. The results showed that under the conditions of 10 to the incident light beam waist w, of Flattened Gaussian beam reflecting mirror width is 3.6 times than the width of the SGB reflection mirror freshman.

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