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Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

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In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...

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Related Experiment Video

Updated: Jun 24, 2026

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
10:28

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

Published on: July 5, 2016

Digital holographic microscopy with physical phase compensation.

Qu Weijuan1, Yu Yingjie, Chee Oi Choo

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

Optics Letters
|April 17, 2009
PubMed
Summary

A novel optical setup for digital holographic microscopy uses a single beam splitter to record holograms. This configuration allows for physical compensation of phase curvature during reconstruction, improving image quality.

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Area of Science:

  • Optical Physics
  • Microscopy
  • Holography

Background:

  • Digital holographic microscopy (DHM) is a powerful imaging technique.
  • Phase aberrations introduced by optical components can degrade image quality in DHM.
  • Conventional DHM setups may require complex aberration correction methods.

Purpose of the Study:

  • To present a new optical configuration for digital holographic microscopy.
  • To simplify the process of recording and reconstructing digital holograms.
  • To achieve physical compensation of phase curvature in DHM.

Main Methods:

  • A single-cube beam splitter was employed in a nonconventional optical configuration.
  • The setup was designed to both split and combine a diverging spherical wavefront from a microscope objective.
  • Digital off-axis holograms were recorded using this configuration.
  • Numerical reconstruction was performed using a plane reference wavefront.

Main Results:

  • The proposed configuration successfully recorded digital off-axis holograms.
  • Physical compensation of phase curvature was achieved during reconstruction.
  • The method effectively corrects for aberrations introduced by the microscope objective and illuminating wave.

Conclusions:

  • The presented optical configuration offers a simplified and effective approach to digital holographic microscopy.
  • This method enables robust compensation of phase curvature, leading to improved holographic reconstructions.
  • The nonconventional use of a single beam splitter provides a practical solution for aberration correction in DHM.