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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 30, Iss. 11 — Jun. 1, 2005
  • pp: 1303–1305

Depth-of-focus reduction for digital in-line holography of particle fields

Weidong Yang, Alexander B. Kostinski, and Raymond A. Shaw  »View Author Affiliations


Optics Letters, Vol. 30, Issue 11, pp. 1303-1305 (2005)
http://dx.doi.org/10.1364/OL.30.001303


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Abstract

Poor axial precision caused, in part, by large depth of focus (tau) has been a vexing problem in extraction of particle position from digital in-line holograms. A simple method is proposed to combat this depth-of-focus difficulty. The method is based on decoupling of size and position information. With d, Delta, and lambda being particle diameter, CCD pixel size, and the wavelength, respectively, our main theoretical result is the reduction of tau from tau∼d²/lambda to tau∼Delta²/lambda for particles of known size. This result is confirmed in laboratory experiments with holograms of calibrated glass spheres.

© 2005 Optical Society of America

OCIS Codes
(090.0090) Holography : Holography
(120.3940) Instrumentation, measurement, and metrology : Metrology

Citation
Weidong Yang, Alexander B. Kostinski, and Raymond A. Shaw, "Depth-of-focus reduction for digital in-line holography of particle fields," Opt. Lett. 30, 1303-1305 (2005)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-30-11-1303

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