半径随机的圆孔波纹锯齿光阑的衍射特性  

Diffraction characteristics of serrated circular aperture with random radius

作　　者：王金国[1] 朱占达[1] 孙哲[1] 惠勇凌[1] 雷訇[1] 李强[1] 

机构地区：[1]北京工业大学激光工程研究院,北京100124

出　　处：《强激光与粒子束》2012年第8期1801-1805,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(61040065);北京市自然科学基金项目(4112005)

摘　　要：研究了半径随角度的变化而随机变化的圆孔波纹锯齿光阑的衍射特性,提出并证明半径随机的圆孔纹波锯齿光阑能改善光束的近场分布和抑制光束中央部分的衍射调制。给出了衍射光轴上和横截面内光强分布的模拟计算结果,通过计算结果可以看出:通过半径随机圆孔波纹锯齿光阑后,衍射光横截面内填充因子比经过调幅型波纹锯齿光阑后的填充因子高,调制强度比经过调幅型波纹锯齿光阑低,并且半径随机锯齿光阑能在较大的空间范围内抑制轴上光强的衍射调制,其可抑制的最远空间距离可达0.15 m。This paper studies the diffraction characteristics of a serrated circular aperture with random radius,and puts forward and proves that the aperture can further improve the near-field distribution of the beam and reduce the diffraction modulation in the beam center.The simulation results of the axial diffraction and the intensity distribution in the cross section are given,which shows the diffraction light after this aperture has higher filling factor and lower modulation rate compared with that after the amplitude modulation serrated aperture.The intensity modulation of Fresnel diffraction on the axis is suppressed by using the random radius serrated aperture in larger space.The farthest range of suppression can reach 0.15 m.

关 键 词：半径随机锯齿光阑 调幅型波纹锯齿光阑 大尺度衍射调制 填充因子 

分 类 号：TN248[电子电信—物理电子学]