Kinoform design with an optimal-rotation-angle method.
Kinoform design with an optimal-rotation-angle method.
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DOI：
10.1364/ao.33.006879
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发表时间：
1994-10
期刊：
影响因子：
1.9
通讯作者：
Jörgen Bengtsson
中科院分区：
文献类型：
--
作者：
Jörgen Bengtsson
Kinoforms（即，用一种新的算法--最佳旋转角法，在近轴域设计了计算产生的相位全息图。这是直接傅立叶方法（即，不执行逆变换），其中选择每个离散点中的开诺全息浮雕的高度，使得衍射效率增加。最佳旋转角算法具有直接的几何解释。它产生的结果接近或优于其他最先进的方法。最佳旋转角算法可以很容易地修改，以考虑不同的约束;例如，相位摆动限制相息图，它将光分布到许多相同的亮点（所谓的扇出），被设计出来。相位摆动限制降低了效率，但仍然可以使均匀性几乎完美。
Kinoforms (i.e., computer-generated phase holograms) are designed with a new algorithm, the optimalrotation- angle method, in the paraxial domain. This is a direct Fourier method (i.e., no inverse transform is performed) in which the height of the kinoform relief in each discrete point is chosen so that the diffraction efficiency is increased. The optimal-rotation-angle algorithm has a straightforward geometrical interpretation. It yields excellent results close to, or better than, those obtained with other state-of-the-art methods. The optimal-rotation-angle algorithm can easily be modified to take different restraints into account; as an example, phase-swing-restricted kinoforms, which distribute the light into a number of equally bright spots (so called fan-outs), were designed. The phase-swing restriction lowers the efficiency, but the uniformity can still be made almost perfect.