用计算全息元件对高斯光束实现贝塞尔变换

Bessel Transformation of Axial Symmetric Gaussian Beam by Computer-Generated Hologram (CGH) Element

用干涉计算全息的方法制成一种能产生螺旋形波面Ａ（ｘ，ｙ）ｅｘｐ［ｉ（ｘ，ｙ）］＝ｅｘｎ［ｉθ］的计算全息元件（ＣＧＨ），并将其用来实现高斯光束的一阶贝塞尔变换。在理论上用计算机模拟此变换，求出变换后的光强分布曲线将其与实验结果进行了比较。还讨论了用该方法实现高斯光束的ｎ阶贝塞尔变换的可能性。

In this paper, one kind of CGH element which can produce spiral wave suface A(x,y)exp[i(x,y)]=exp(i)) is made by using interference CGH method, and the first order Bessel transformation of axial symmetric Gaussian beam is obtained by this element. At the same time,this transformation is imitated by computer in theory. The calculating light intensity distribution of this transformation is gotten and campared with the experiment result. In this paper, n order Bessel transformation of axial symmetric Gaussian beam by this method is disgussed.