High focal depth with a quasi-bifocus birefringent lens

被引：48

作者：

Sanyal, S ^{[1
]}

Ghosh, A ^{[1
]}

机构：

[1] Univ Calcutta, Dept Appl Phys, Kolkata 700009, W Bengal, India

来源：

APPLIED OPTICS | 2000年 / 39卷 / 14期

关键词：

D O I：

10.1364/AO.39.002321

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The Strehl definition along the axis of a birefringent lens sandwiched between two polarizers is studied analytically. The optic axis of the birefringent lens made of a uniaxial crystal is perpendicular to the lens axis, and the system behaves libe a bifocus lens for proper orientation of the polarizers. The Sparrow criterion is employed for designing an imaging system with high depth of focus. tis shown that, when the two foci are separated by the Sparrow limit of resolution, the focal depth is maximum and the intensity point-spread function remains almost identical within this limit; The resolution according to the Rayleigh criterion in this zone is more than that of an ideal lens. (C) 2000 Optical Society of America. OCIS codes: 230.5440, 260.5430, 260.1440, 220.1230, 220.3630, 350.4600.

引用

页码：2321 / 2325

页数：5

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