Influence of design parameters of diffractive optical elements on diffraction efficiency in beam smoothing

被引：1
|
作者：
Cao G. [1 ]
Liu Q. [1 ]
Shi P. [1 ]
Li Y. [1 ,2 ]
机构：
[1] Department of Physics, University of Science and Technology of China
[2] Key Laboratory of Quantum Information, Chinese Academy of Sciences
来源：
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | 2010年 / 22卷 / 02期
关键词：
Beam smoothing; Diffraction efficiency; Diffractive optical elements; Distributed phase plate;
D O I：
10.3788/HPLPB20102202.0369
中图分类号：
学科分类号：
摘要：
The reason is theoretically discussed for the existence of sub-diffractive spots around the focal spot and the decrease of diffraction efficiency in beam smoothing by 320 mm-diameter diffractive optical elements. Through the simulation analysis, it is suggested that, by means of adjusting the design parameters, the intensity of sub-diffractive spots can be suppressed effectively, which can ensure the effect of diffractive optical elements in beam smoothing. For example, by appropriately increasing sampling points, the proportion of focal spot to whole output range, named Yita, can be decreased, and the efficiency loss engendered by sub-diffractive spots would be restricted. When Yita is less than 0.2, the efficiency loss can be controlled within 2%. The experimental results with 70 mm- and 320 mm-diameter distributed phase plates have validated the simulation results.
引用
收藏
页码：369 / 373
页数：4
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