1Key Laboratory for Optical and Magnetic Resonance Spectroscopy, Department of Physics, Department of Physics, Suzhou University, Suzhou 215006
2East China Normal University, Shanghai 200062
3The Laboratory for Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Shanghai 201800
An Atomic Lens Using a Focusing Hollow Beam
XIA Yong2;YIN Jian-Ping1,2;WANG Yu-Zhu3
1Key Laboratory for Optical and Magnetic Resonance Spectroscopy, Department of Physics, Department of Physics, Suzhou University, Suzhou 215006
2East China Normal University, Shanghai 200062
3The Laboratory for Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Shanghai 201800
Abstract： 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 w0 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 185Rb 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 angstoms.
2003, Vol. 20 
