排序方式: 共有46条查询结果,搜索用时 218 毫秒
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二元光学波面变形器件的研究 总被引:4,自引:0,他引:4
基于计算全息原理设计了二元光学波面变形器件,一块二元光学器件的衍射效率比计算全息可提高4倍,高斯波面整形需要二块整形光学器件,二元光学器件的激光利用率比计算全息提高16倍,而且制做工艺简单. 相似文献
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The wavelet and harmonic filtering method suggested by Zalevsky and Ouzieli is introduced in this paper and adopted in our volume holographic image recognition system. This composite filter combines several scaled versions of the cascaded wavelet and harmonic filter, obtaining high discrimination ability and wide dynamic range of rotation and scale deformations. Optical experiments are conducted to demonstrate the validity and practicability of the algorithm. To the best of our knowledge, this is the first report of using this algorithm in a volume holographic system. Moreover, the separate correlation approach proposed in this paper greatly simplifies the manufacturing process and reduces the cost of the system. 相似文献
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光谱色散匀滑技术与衍射光学器件联用性能的空间频谱分析 总被引:1,自引:0,他引:1
基于空间频谱分析方法,建立了光谱色散匀滑技术(SSD: Smoothing by Spectral Dispersion)与衍射光学器件(DOE: Diffractive Optical Element)联用性能的简化分析模型,为SSD与DOE联用时,SSD参量的优化提供了理论依据.数值模拟了SSD各参量,包括脉冲时间、调制频率、位相调制系数、光栅线色散系数等对束匀滑性能的影响.模拟结果表明,SSD参量经过优化选取,且波前畸变随时间快速变化时,能获得良好的束匀滑性能. 相似文献
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A linear system model for planar concave grating demultiplexer is developed based on the scalar diffraction theory. With this model the system can be simulated by using Fourier transform. Many device performances such as dispersion features, N × N interconnection, channel uniformity, insertion loss, crosstalk can be estimated or optimized. Furthermore, the behavior of aberration is included in the generalized model. 相似文献
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在折衍混合光学系统的加工和装配过程中,折、衍器件间的对中精度严重影响混合器件的质量和性能,但是由于衍射器件与传统折射器件的显着差异,传统的对中手段已不再适用,如何简便实现二者的精确对中是混合光学系统实用化过程中亟待解决的问题之一.本文提出利用干涉原理简便地实现衍射器件与折射器件的高精度对中,理论分析和实验结果表明该对中装校方法是有效可行的,可以满足光学系统的对中要求。 相似文献