光学 精密工程, 2010, 18 (3): 536, 网络出版: 2010-08-31   

波前编码技术扩展焦深的系统实验

Experiments of extending depth of focus through wave-front coding technology
作者单位
1 中国科学院 长春光学精密机械与物理研究所 光学系统先进制造技术中国科学院重点实验室,吉林 长春 130033
2 中国科学院 研究生院,北京 100039
摘要
为了扩大光学系统的焦深,建立了采用波前编码技术的光学/数字一体化系统,通过在普通光学系统孔径光阑处加入一个位相掩模板和后期数字处理的优化结合,实现了光学系统焦深的大幅扩展。介绍了波前编码技术的提出、发展及理论基础,设计了一个三片式的三次位相板系统,利用光学设计软件CODEV对传统系统和波前编码系统的成像特性进行了对比分析,给出了±40倍离焦范围内的点扩散函数三维轮廓图和调制传递函数曲线。最后,对研制的系统进行成像实验,并对波前编码系统解码前后的成像效果与传统系统进行了比较。实验结果表明,与传统系统相比,所设计的波前编码系统可以在保持光通量和像面分辨率的情况下将焦深扩展40倍。
Abstract
In order to extend the depth of focus of optical systems, an optical-digital system using wave-front coding technology was established.By adding a phase mask at the aperture stop of a general optical system combined with post-digital processing, this system extended its depth of focus greatly.Firstly, the proposal, development and theoretical basis of wave-front coding were briefly introduced; then, a triplet system with a cubic-phase-plate was designed, and the imaging characteristics of the traditional system and wave-front coding system were analyzed using CODEV.Furthermore, the three-dimensional contour maps of Point Spread Function (PSF) and the Modulation Transfer Function(MTF) curves within defocus of ±40 times were obtained.Finally, the imaging experiment of manufactured system was carried out, and the images of a traditional system and a wave-front coding system before and after decoding were compared.The results show that the wave-front coding system can extend the depth of focus by 40 times compared with the traditional system while maintaining the light flux and image plane resolution.

张欣, 张新, 张建萍, 何锋赟. 波前编码技术扩展焦深的系统实验[J]. 光学 精密工程, 2010, 18(3): 536. ZHANG Xin, ZHANG Xin, ZHANG Jian-ping, HE Feng-yun. Experiments of extending depth of focus through wave-front coding technology[J]. Optics and Precision Engineering, 2010, 18(3): 536.

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