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Focusing properties of Gaussian beam by a nonspiral phase plate system》.pdf
ARTICLE IN PRESS OOptikptik Optics Optik 119 (2008) 671–681 www.elsevier.de/ijleo Focusing properties of Gaussian beam by a nonspiral phase plate system a,b, c c a Jinsong Li , Xiumin Gao , Jian Wang , Songlin Zhuang a College of Optics and Electronics, University of Shanghai for Science and Technology, Shanghai 20093, PR China b College of Optics and Electronics, China Jiliang University, Hangzhou 310018, PR China cElectronics and Information College, Hangzhou Dianzi University, Hangzhou 310018, PR China Received 5 January 2007; accepted 15 April 2007 Abstract In this article, a nonspiral plate is investigated numerically by vector diffraction theory to observe the focusing properties of Gaussian beams. Both low- and high-numerical-aperture (NA) optical systems are considered in the investigation. It is found that the parameter of NA and the phase vary rate of the phase plate influence the focal intensity distribution considerably. When a nonspiral plate is used to provide linear phase variation on one half of the Gaussian beam, it may adjust the focal spot considerably and conveniently. Changing the vary rate of the phase plate or the parameter of NA can alter optical intensity distribution; some novel focal spots and focal switch may also occur. r 2007 Elsevier GmbH. All rights reserved. Keywords: Gaussian beam; Nonspiral phase plate; Intensity distribution; Vector diffraction theory 1. Int
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