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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Off-axis digital holographic camera for quantitative phase microscopy.

Zahra Monemhaghdoust1, Frédéric Montfort2, Yves Emery3

  • 1Ecole Polytechnique Fédérale de Lausanne, Laboratory of Applied Photonics Devices, CH-1015 Lausanne, Switzerland.

Biomedical Optics Express
|June 19, 2014
PubMed
Summary
This summary is machine-generated.

We developed a digital holographic camera for microscopes that captures holograms in a single shot. This system uses holographic gratings for robust, high-visibility imaging, producing detailed phase images of samples.

Keywords:
(050.1950) Diffraction gratings(050.7330) Volume gratings(090.1995) Digital holography(110.0180) Microscopy(180.3170) Interference microscopy(330.6110) Spatial filtering

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Area of Science:

  • Microscopy
  • Optical Imaging
  • Holography

Background:

  • Digital holographic microscopy (DHM) enables quantitative phase imaging.
  • Conventional DHM systems can be complex and sensitive to alignment.

Purpose of the Study:

  • To develop and demonstrate a compact, single-shot digital holographic camera for conventional microscopes.
  • To improve alignment stability and field-of-view interference visibility in DHM.

Main Methods:

  • A self-reference holographic camera utilizing a thick holographic grating for spatial filtering and a thin holographic grating for coherence plane tilt correction.
  • Short coherence illumination and single-shot hologram acquisition.
  • Off-axis hologram processing to retrieve amplitude and phase information.

Main Results:

  • Experimental demonstration of the digital holographic camera attached to a standard microscope.
  • High-visibility interference over the entire field of view achieved.
  • Phase images of cheek cells comparable to those from commercial DHM systems were obtained.

Conclusions:

  • The proposed digital holographic camera offers a robust and user-friendly approach for quantitative phase imaging with standard microscopes.
  • The use of holographic gratings enhances stability and simplifies alignment compared to traditional methods.
  • This system provides a viable alternative for biological and materials science applications requiring phase contrast imaging.