%0 Journal Article
%T A new synthesis method for synthesizing on-axis flat-topped beams by using a defocusing telescope system<br>使用离焦望远镜系统合成轴上平顶光束的一种新方法
%A Zhao Bao-Yin
%A <br>赵保银
%A 吕百达
%J 物理学报
%D 2008
%I 
%X A new method for synthesizing on-axis flat-topped beams by using a defocusing telescope system is proposed, where the flat-topped multi-Gaussian beam is chosen as the ideal beam. Within the framework of the paraxial approximation and based on the Collins diffraction integral formula, the analytical expressions for the on-axis field and incident field are derived and analyzed physically. The effect of beam order N, flat-top length parameter L, position of the flat-top centre zc and central longitudinal spatial frequency Sc on the on-axis intensity distribution is illustrated by numerical examples. A comparison of our results with the method for simulating the ideal beam by use of the rectangular function shows the advantages of our method.
%K on-axis flat-topped beam
%K flat-topped multi-Gaussian beam
%K defocusing telescope system
%K Fourier transform<br>轴上平顶光束，
%K 平顶多高斯光束，
%K 离焦望远镜系统，
%K 傅里叶变换
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=467063A88F01675BBB2A11136E681982&yid=67289AFF6305E306&vid=11B4E5CC8CDD3201&iid=94C357A881DFC066&sid=C134264DB13A76BD&eid=27FAC91000938407&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=14