Spatially smooth evanescent-wave profiles in a multimode hollow optical fiber for atom guiding
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- 作者：Hautakorpi ; Markus ; Shevchenko ; A. ; Kaivola ; M.
- 关键词：32.80.Pj ; 39.25.+k ; 03.75.Be ; Hollow optical fiber ; Atom guiding ; Orbital angular momentum of light ; Speckle
- 刊名：Optics Communications
- 出版年：2004
- 出版时间：July 1, 2004
- 年：2004
- 卷：237
- 期：1-3
- 页码：103-110
- 全文大小：263 K
文摘
We analyze two methods for obtaining a smooth evanescent-wave intensity profile on the inner surface of a multimode hollow optical fiber to be used as a waveguide for neutral atoms. The first method is based on the selective excitation of fiber modes with a laser beam possessing orbital angular momentum, of which Laguerre–Gaussian beams are considered as an example. The second method makes use of a rapid variation of the speckle pattern of the fiber's evanescent-wave in the timescale of the atomic motion. The variation is provided by dithering the angle of incidence of a Gaussian laser beam at the fiber entrance. The optimal beam waist and direction of dithering are determined.