Abstract
We propose a new method to generate a focused hollow laser beam by usingan azimuthally distributed 2π-phase plate and a convergent thinlens, and calculate the intensity distribution of the focused hollowbeam in free propagation space. The relationship between the waist wo ofthe incident collimated Gaussian beam and the dark spot size of thefocused hollow beam at the focal point, and the relationship between thefocal length f of the thin lens and the dark spot size are studiedrespectively. The optical potential of the blue-detuned focused hollowbeam for 85Rb atoms is calculated. Our study shows that when thelarger waist w of the incident Gaussian beam and the shorter focallength f of the lens are chosen, we can obtain an extremely small darkspot size of the focused hollow beam, which can be used to form anatomic lens with a resolution of several angstroms.
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