Diffractive optical elements for beam shaping of monochromatic spatially incoherent light
Diffractive optical elements for beam shaping of monochromatic spatially incoherent light
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DOI：
10.1364/ao.45.008440
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发表时间：
2006-11-20
期刊：
影响因子：
1.9
通讯作者：
Taghizadeh, M. R.
中科院分区：
文献类型：
--
作者：
Liu, J. S.;Caley, A. J.;Taghizadeh, M. R.
菲涅耳型衍射光学元件（DOE）的一般光束整形的单色，空间非相干光的演示。直接和间接方法，即，将透镜相位添加到所设计的Fraunhofer型DOE用于设计。间接法可以在不损失设计精度的情况下将计算时间减少约一半。两个不同的设计实例。对于一种设计，直接方法给出了信号窗口中最大强度的5.0%的最大旁瓣强度。对于第二个设计，间接法给出该值的23.0%。生成的图案可以在很长的距离上保持其基本形状。这些元件是直接用灰度商业幻灯片作为掩模制作的。实验结果与数值预测吻合较好。(c)2006年美国光学学会。
Fresnel-type diffractive optical elements (DOEs) for general beam shaping of monochromatic, spatially incoherent light are demonstrated. Direct and indirect methods, i.e., adding a lens' phase to the designed Fraunhofer-type DOEs, are used for the design. The indirect method can reduce the calculation time by approximately half without loss of design accuracy. Two different design examples are shown. For one design the direct method gives a maximum sidelobe intensity of 5.0% of the maximum intensity in the signal window. For the second design the indirect method gives 23.0% of this value. The generated patterns can maintain their basic shapes over a long distance. The elements have been fabricated by directly using gray-scale commercial slides as masks. Experimental results are in close agreement with numerical predictions. (c) 2006 Optical Society of America.