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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Coherence requirement in digital holography.

Daniel Claus1, Daciana Iliescu, John M Rodenburg

  • 1Kroto Research Centre, University of Sheffield, Sheffield S3 7HQ, UK. d.claus@sheffield.ac.uk

Applied Optics
|January 8, 2013
PubMed
Summary
This summary is machine-generated.

This study compares coherence requirements for Fresnel, Fourier, and image-plane holography. Findings aid selecting light sources and holographic setups for digital holography applications.

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Area of Science:

  • Optics and Photonics
  • Digital Holography

Background:

  • Holographic setups have varying coherence requirements.
  • Understanding these requirements is crucial for selecting appropriate light sources and configurations.

Purpose of the Study:

  • To compare the coherence requirements for Fresnel, Fourier, and image-plane holographic setups.
  • To guide the selection of light sources and holographic configurations for digital holography.
  • To determine the minimum recording distance for Nyquist sampling.

Main Methods:

  • Analysis of interference patterns from reference and object waves.
  • Investigation of in-line and off-axis holographic recording modes.
  • Comparison of coherence needs across different holographic geometries.

Main Results:

  • Coherence requirements differ significantly among Fresnel, Fourier, and image-plane holograms.
  • The study provides a basis for matching light sources to specific digital holographic setups.
  • Minimum focal lengths for Nyquist sampling in holography were derived.

Conclusions:

  • The findings facilitate the optimal choice of light sources and holographic techniques.
  • This research supports the effective utilization of short coherence light sources in digital holography.
  • Essential parameters for accurate hologram recording and sampling are elucidated.