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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 7, Iss. 7 — Jun. 25, 2012

Partially coherent light-emitting diode illumination for video-rate in-line holographic microscopy

Paul Petruck, Rainer Riesenberg, and Richard Kowarschik  »View Author Affiliations


Applied Optics, Vol. 51, Issue 13, pp. 2333-2340 (2012)
http://dx.doi.org/10.1364/AO.51.002333


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Abstract

The light of a light-emitting diode or a common thermal source, such as a tungsten filament lamp, is known to be quasi-incoherent. We generated partially coherent light of these sources with a volume of coherence in the micrometer range of 5100μm3 by spatial and spectral filtering. The corresponding degree of partial coherence was adapted for microscopic interference setups, such as a digital in-line holographic microscope. The practicability of the sources was determined by the spectral emittance and the resulting signal-to-noise ratio (SNR) of the detector. The microscale coherence in correlation with the SNR and its resolution for microscopy were analyzed. We demonstrate how low-light-level, non-laser sources enable holographic imaging with a video frame rate (25frames/s), an intermediate SNR of 8 dB, and a volume of coherence of 3.4×104μm3. Holograms of objects with a lateral resolution of 1 μm were achieved using a microscope lens (50×/NA=0.7) and a CCD camera featuring a 4–12 bit dynamic range.

© 2012 Optical Society of America

OCIS Codes
(090.0090) Holography : Holography
(110.0180) Imaging systems : Microscopy
(110.4280) Imaging systems : Noise in imaging systems
(110.4980) Imaging systems : Partial coherence in imaging
(090.5694) Holography : Real-time holography

ToC Category:
Holography

History
Original Manuscript: November 28, 2011
Revised Manuscript: February 10, 2012
Manuscript Accepted: February 11, 2012
Published: April 30, 2012

Virtual Issues
Vol. 7, Iss. 7 Virtual Journal for Biomedical Optics

Citation
Paul Petruck, Rainer Riesenberg, and Richard Kowarschik, "Partially coherent light-emitting diode illumination for video-rate in-line holographic microscopy," Appl. Opt. 51, 2333-2340 (2012)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-51-13-2333

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» Media 1: MOV (3985 KB)     
» Media 2: MOV (3983 KB)     
» Media 3: MOV (4020 KB)     
» Media 4: MOV (4038 KB)     

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