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Phase Contrast and Differential Interference Contrast Microscopy01:26

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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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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Experimental verification of coherent diffractive imaging by a direct phase retrieval method with an aperture-array

Nobuharu Nakajima1

  • 1Faculty of Engineering, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu, 432-8561, Japan. tsnnaka@ipc.shizuoka.ac.jp

Optics Letters
|June 21, 2011
PubMed
Summary

We demonstrate a new coherent imaging technique using a noniterative phase retrieval method and an aperture array filter. This method reconstructs complex objects from single diffraction intensity measurements without iterative constraints or reference waves.

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Area of Science:

  • Optics and Photonics
  • Image Reconstruction
  • Diffractive Imaging

Background:

  • Coherent diffractive imaging (CDI) traditionally relies on iterative algorithms or holographic methods.
  • Iterative CDI requires tight object support constraints, and holographic CDI needs a reference wave.
  • Noniterative phase retrieval methods offer potential simplifications but often require specific experimental setups.

Purpose of the Study:

  • To experimentally demonstrate a novel noniterative phase retrieval method for coherent diffractive imaging.
  • To reconstruct a complex-valued object using isolated diffraction intensities from an aperture array filter.
  • To showcase an imaging technique that bypasses the limitations of traditional CDI approaches.

Main Methods:

  • Utilized a diode laser to illuminate a complex-valued object.
  • Employed an aperture array filter (square apertures) to isolate diffraction intensities.
  • Applied a noniterative phase retrieval algorithm to reconstruct the object's wave field.

Main Results:

  • Successfully reconstructed a complex-valued object from a single diffraction intensity measurement.
  • Demonstrated the feasibility of noniterative phase retrieval with an aperture array filter.
  • Achieved coherent imaging without iterative support constraints or a reference wave.

Conclusions:

  • The presented method offers a simplified and efficient approach to coherent diffractive imaging.
  • This technique eliminates the need for iterative algorithms and holographic setups.
  • It represents a significant advancement in practical phase retrieval for imaging applications.