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《Acta Optica Sinica》 2008-01
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Variation of-Phase Branch Point Number with Turbulence Strength in Laser Propagation through Atmosphere

Ge Xiaolu1,2 Fan Chengyu1 Wang Yingjian11 Center for Atmospheric Optics,Anhui Institute of Optics and Fine Mechanics,the Chinese Academy of Sciences,Hefei,Anhui 230031,China2 School of Physics and Optoelectronic Information Technology,Shandong University of Technology,Zibo,Shandong 255049,China  
When branch points are present in laser beam wavefront during the propagation in turbulence,the adaptive-optics system for atmosphere turbulence compensation will be degraded greatly.The number of branch points was computed by four-dimensional code.By choosing different phase screen number,grid size and grid step,the variation of branch point number with turbulence strength in distorted optical fields was emulated.The result indicates that branch points cannot be detected in the region of weak turbulence.In the intermediate region between the weak and the strong turbulences,the branch points begin to appear,and the number of branch points grows rapidly at the outset of this region,almost linearly.When the turbulence strength continues growing,the rapid growth of the branch point number is replaced by a slower but nonlinear increase.In the end,the branch point number reaches a saturation state.In addition,the branch point number and its evolvement are different in different propagation conditions.
【Fund】: 国家自然科学基金(10574127);; 中国科学院合肥物质科学研究院物质计算中心资助课题
【CateGory Index】: TN929.1
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【Citations】
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【Co-citations】
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1 GE Xiao-lu, FAN Cheng-yu (Center for Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China);Relationship Between the Number of Branch Points and the Characteristic Parameters of Turbulence Effect[J];Journal of Atmospheric and Environmental Optics;2007-01
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Chinese Journal Full-text Database 1 Hits
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