| 衍射光学元件设计参数对束匀滑衍射效率的影响 |
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| 引用本文： | 曹国威, 刘强, 石鹏, 等. 衍射光学元件设计参数对束匀滑衍射效率的影响[J]. 强激光与粒子束, 2010, 22(02). |
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| 作者姓名： | 曹国威 刘强 石鹏 李永平 |
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| 作者单位： | 1.中国科学技术大学 物理系, 合肥 230026;;;2.中国科学院 量子信息重点实验室, 合肥 230026 |
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| 摘 要： | 经过理论推导，分析了320 mm口径衍射光学元件在束匀滑实验中光强分布出现高级次衍射斑和元件实际衍射效率变低的原因，模拟计算得到了接近实验的光强分布。模拟分析发现:通过调整设计参数，如适当增加抽样点数，使设计时焦斑主瓣占输出计算窗口的比例减小至0.2以下，可以大大降低由于高级次衍射斑造成的衍射效率损失，控制在2%以内，使台阶分布式相位片实际衍射效率得到提高，在对口径为70及320 mm的台阶分布式相位片样品测试中得到了验证。
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| 关 键 词： | 衍射光学元件 束匀滑 衍射效率 台阶分布式相位片 |
Influence of design parameters of diffractive optical elements on diffraction efficiency in beam smoothing |
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| cao guowei, liu qiang, shi peng, et al. Influence of design parameters of diffractive optical elements on diffraction efficiency in beam smoothing[J]. High Power Laser and Particle Beams, 2010, 22. |
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| Authors: | cao guowei liu qiang shi peng li yongping |
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| Affiliation: | 1. Department of Physics,University of Science and Technology of China,Hefei 230026,China;;;2. Key Laboratory of Quantum Information,Chinese Academy of Sciences,Hefei 230026,China |
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| Abstract: | 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 |
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| Keywords: | diffractive optical elements beam smoothing diffraction efficiency distributed phase plate |
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