A new scheme to realize a two-dimensional (2D) array of magnetic micro-lenses for a cold atomic beam, formed by an array of square current-carrying wires, is proposed. We calculate the spatial distributions of the magnetic fields from the array of current-carrying wires and the magnetic focusing potential for cold rubidium atoms, and study the dynamic focusing processes of cold atoms passing through the magnetic micro-lens array and its focusing properties by using Monte-Carlo simulations and trajectory tracing method. The result shows that the proposed micro-lens array can be used to focus effectively a cold atomic beam, even to load ultracold atoms or a BEC sample into a 2D optical lattice formed by blue detuned hollow beams.
© 2006 Chinese Optics Letters
(020.0020) Atomic and molecular physics : Atomic and molecular physics
(020.7490) Atomic and molecular physics : Zeeman effect
(220.2560) Optical design and fabrication : Propagating methods
(220.3620) Optical design and fabrication : Lens system design
Yang Liu, Min Yun, and Jianping Yin, "Magnetic focusing of cold atomic beam with a 2D array of current-carrying wires," Chin. Opt. Lett. 4, 497-500 (2006)