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Journal of Sanming University

Partially Coherent Bottle Beams

LI Qing-hong

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

The generation of the partially coherent bottle beam is investigated.It is shown that the partially coherent bottle beams can be achieved by focusing the partially coherent light with an axicon-lens system.The influence of the spatial coherence of the incident partially coherent light as well as the distance between the focusing lens and the axicon on the size of the bottle beams is investigated.We find that the larger the spatial coherence is,the larger is the size of the resultant bottle beams and the increment of the distance between the focusing lens and the axicon results in the decrease of the size of the bottle beams.This provides a facile approach for generating adjustable partially coherent bottle beams.This kind of partially coherent bottle beams may have applications in atom optics,such as in atom trapping and atom guiding etc.

Related papers

Generation of adjustable partially coherent bottle beams by use of an axicon-lens system

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We report, what is to our knowledge, the first experimental realization of partially coherent bottle beams. It is shown that partially coherent bottle beams can be achieved by the focusing of partially coherent light with an axicon-lens system. The influence of the spatial coherence of the incident partially coherent light and other parameters, such as the radius of the limiting aperture of the axicon and the distance between the axicon and the lens, on the size of the bottle beams is investigated. We find that the longer the spatial coherence length, the larger the size of the resultant bottle beams. This dependence of the size of the bottle beams on the spatial coherence of the incident light provides a facile approach for generating adjustable partially coherent bottle beams. This kind of partially coherent bottle beam may have applications in atom optics, such as in atom trapping and atom guiding, etc.

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Chinese Physics Letters•Apr 24, 2003•7 citations
The generation of the partially coherent bottle beam is investigated.It is shown that the partially coherent bottle beams can be achieved by focusing the partially coherent light with an axicon-lens system.The influence of the spatial coherence of the incident partially coherent light as well as the distance between the focusing lens and the axicon on the size of the bottle beams is investigated.We find that the larger the spatial coherence is,the larger is the size of the resultant bottle beams and the increment of the distance between the focusing lens and the axicon results in the decrease of the size of the bottle beams.This provides a facile approach for generating adjustable partially coherent bottle beams.This kind of partially coherent bottle beams may have applications in atom optics,such as in atom trapping and atom guiding etc.
We report, what is to our knowledge, the first experimental realization of partially coherent bottle beams. It is shown that partially coherent bottle beams can be achieved by the focusing of partially coherent light with an axicon-lens system. The influence of the spatial coherence of the incident partially coherent light and other parameters, such as the radius of the limiting aperture of the axicon and the distance between the axicon and the lens, on the size of the bottle beams is investigated. We find that the longer the spatial coherence length, the larger the size of the resultant bottle beams. This dependence of the size of the bottle beams on the spatial coherence of the incident light provides a facile approach for generating adjustable partially coherent bottle beams. This kind of partially coherent bottle beam may have applications in atom optics, such as in atom trapping and atom guiding, etc.
We have realized a conical matter wave lens. The repulsive potential of a focused laser beam was used to launch a Bose-Einstein condensate into a radially expanding wavepacket whose perfect ring shape was ensured by energy conservation. In spite of significant interactions between atoms, the spatial and velocity widths of the ring along its radial dimension remained extremely narrow, as also confirmed by numerical simulations. Our results open the possibility for cylindrical atom optics without the perturbing effect of mean-field interactions.
The bottle beam configuration is a light field created by the interference of a pair of Laguerre–Gauss light beams with zero orbital angular momentum. In this work we show the theoretical study of the bottle beam as well as the use of this beam for the creation of a novel atom optical dipole trap namely the bottle atom trap. In such a trap the resulting dark trapping region is three-dimensional and has a cylindrical symmetry. These promising results show that this trap is a nice candidate for trapping Bose–Einstein condensates and may serve as an optical tweezer mechanism potentially useful for trapping micron-sized dielectric particles.
We propose a new method to generate a focused hollow laser beam by using an azimuthally distributed 2π-phase plate and a convergent thin lens, and calculate the intensity distribution of the focused hollow beam in free propagation space. The relationship between the waist w o of the incident collimated Gaussian beam and the dark spot size of the focused hollow beam at the focal point, and the relationship between the focal length f of the thin lens and the dark spot size are studied respectively. The optical potential of the blue-detuned focused hollow beam for 85 Rb atoms is calculated. Our study shows that when the larger waist w of the incident Gaussian beam and the shorter focal length f of the lens are chosen, we can obtain an extremely small dark spot size of the focused hollow beam, which can be used to form an atomic lens with a resolution of several angstroms.