相位光阑对光学系统中焦深的影响  

Effect of phase diaphragm on focal depth of optical systems

作　　者：高秀敏[1] 王健[1] 顾海涛[1] 胡松[1] 

机构地区：[1]杭州电子科技大学电子信息学院,浙江杭州310018

出　　处：《应用光学》2008年第3期330-335,共6页Journal of Applied Optics

基　　金：国家自然科学基金(60708002;50574035);国家863项目(2006AA040310);杭州电子科技大学科研项目(KYS051506021)

摘　　要：焦深在高密度光盘存储系统中具有十分重要的作用,大焦深可以使调焦伺服系统容易跟踪盘面。采用标量衍射理论和基于德拜近似条件的矢量衍射理论,分别在低数值孔径和高数值孔径两种情况下,系统研究相位光阑对聚焦光学系统的轴向光强分布和焦深的影响。研究结果表明:相位光阑对光学系统的焦深影响很大,高数值孔径系统中,选择适当的相位光阑几何尺寸可以使焦深提高约6倍。Focal depth plays an important role in optical storage systems, and high focal depth makes the focusing servo system easy to track the disk surface. The effect of the pure-phase diaphragm on the axial light-intensity distribution and focal depth was investigated in low-and high-numerical aperture systems by means of scalar diffractive theory and vector diffractive theory, respectively. The results show that the proposed phase diaphragm affects the focal depth considerably, and the focal depth may increase by six times for certain geometrical parameters of the phase diaphragm in the systems with high-numerical aperture.

关 键 词：焦深 光存储 相位光阑 光强分布 

分 类 号：O438[机械工程—光学工程]