无衍射光束由于其中心光斑尺寸小、传播中无衍射等特性被广泛关注.提出了一种相位全息图产生任意阶次和位置的无衍射光束阵列的方法.设计具有相同特征值的相全息图阵列,即阵列中每幅相全息图在频谱面上产生相同半径的亮环,并把相全息图阵列写入空间光调制器,由于傅里叶变换平移不变性,相全息图阵列在频谱面上仍产生唯一能量集中的亮环,通过环形滤波器将其滤出,再次进行傅里叶变换,便得到无衍射光束阵列,并且每个无衍射光束的位置和阶次都可以任意设置.理论分析和实验均证明了该方法的可行性.
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