Aberration-Free Fraunhofer Holography Of Micro-Objects

C. S. Vikram; M. L. Billet

doi:10.1117/12.947572

16 January 1989 Aberration-Free Fraunhofer Holography Of Micro-Objects

C. S. Vikram, M. L. Billet

Proceedings Volume 0954, Optical Testing and Metrology II; (1989) https://doi.org/10.1117/12.947572
Event: SPIE International Symposium on Optical Engineering and Industrial Sensing for Advance Manufacturing Technologies, 1988, Dearborn, MI, United States

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.

Citation Download Citation

C. S. Vikram and M. L. Billet "Aberration-Free Fraunhofer Holography Of Micro-Objects", Proc. SPIE 0954, Optical Testing and Metrology II, (16 January 1989); https://doi.org/10.1117/12.947572

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