Focal shift and astigmatism for a circular zone plate

Shaomin Wang; Xiaoqing Jiang; Qiang Lin; Eusebio Bernabeu; Javier Alda; Victoria Martin

doi:10.1117/12.144158

11 May 1993 Focal shift and astigmatism for a circular zone plate

Shaomin Wang, Xiaoqing Jiang, Qiang Lin, Eusebio Bernabeu, Javier Alda, Victoria Martin

Proceedings Volume 1979, 1992 International Conference on Lasers and Optoelectronics; (1993) https://doi.org/10.1117/12.144158
Event: 1992 International Conference on Lasers and Optoelectronics, 1992, Bejing, China

Abstract

Focal shift of the zone plate is completely different from the corresponding circular and annular apertures. Focal powers of the zone plate are constant under some conditions but for the latter they are always variables. Astigmatism for a zone plate is also investigated. The sagittal focal surfaces are unchanged but the tangential focal surfaces are changed as a function: cos²(Theta) , besides, it has neither spherical aberration nor coma. They are also completely different from conventional imaging devices.

Citation Download Citation

Shaomin Wang, Xiaoqing Jiang, Qiang Lin, Eusebio Bernabeu, Javier Alda, and Victoria Martin "Focal shift and astigmatism for a circular zone plate", Proc. SPIE 1979, 1992 International Conference on Lasers and Optoelectronics, (11 May 1993); https://doi.org/10.1117/12.144158

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