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Proceedings Paper

Aberration-Free Fraunhofer Holography Of Micro-Objects
Author(s): C. S. Vikram; M. L. Billet
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Paper Abstract

For correct size and shape analysis of very small micro-objects by holography, aberrations play an important limiting role. A unique characteristic of in-line Fraunhofer holography with collimated beam recording is that each object can be considered to be on the optical axis. During the reconstruction, the hologram center can again be made to pass through the optical axis. With this arrangement, all the off-axis aberrations practically disappear. This aspect has been discussed in this article for practical size ranges encountered in far-field holography. Spherical aberration can also be removed by proper sphericity of the reconstruction beam in terms of reconstruction-to-recording wavelength ratio and the object-to-hologram distance. These conditions are obtained by equating the third order spherical aberration to zero. The situation is then described for object space ranges for tolerable aberrations satisfying Marechal's criterion.

Paper Details

Date Published: 16 January 1989
PDF: 6 pages
Proc. SPIE 0954, Optical Testing and Metrology II, (16 January 1989);
Show Author Affiliations
C. S. Vikram, Penn State University (United States)
M. L. Billet, Penn State University (United States)

Published in SPIE Proceedings Vol. 0954:
Optical Testing and Metrology II
Chander Prakash Grover, Editor(s)

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