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Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Transmission digital holographic microscopy based on a beam-splitter cube interferometer.

Weijuan Qu1, Kallol Bhattacharya, Chee Oi Choo

  • 1School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798. ququ@siom.ac.cn

Applied Optics
|May 22, 2009
PubMed
Summary

A novel digital holographic microscopy configuration uses a single beam splitter for improved resolution. This simple, vibration-insensitive setup reconstructs both amplitude and phase for microscopic samples.

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Area of Science:

  • Optical microscopy
  • Holography
  • Image reconstruction

Background:

  • Digital holographic microscopy (DHM) enables quantitative phase and amplitude imaging.
  • Conventional DHM setups can be complex and sensitive to environmental vibrations.

Purpose of the Study:

  • To present a new, simplified optical configuration for digital off-axis holography.
  • To achieve high-resolution amplitude and phase imaging in microscopy.

Main Methods:

  • A single cube beam splitter is employed in a nonconventional configuration.
  • A diverging spherical wavefront from a single point source is used for illumination.
  • Digital off-axis holograms are recorded and processed for reconstruction.

Main Results:

  • The proposed configuration yields intensity and phase images with enhanced resolution.
  • The system demonstrates insensitivity to vibrations.
  • Phase curvature from the illuminating wavefront is inherently compensated.

Conclusions:

  • The novel optical configuration offers a simple and robust method for DHM.
  • It provides improved resolution and phase compensation for microscopic imaging applications.