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Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
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Updated: May 22, 2026

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Published on: July 5, 2016

Highly compact imaging using Bessel beams generated by ultraminiaturized multi-micro-axicon systems.

Niklas Weber1, Dominik Spether, Andreas Seifert

  • 1Laboratory for Micro-optics, Department of Microsystems Engineering, Georges-Köhler-Allee 102, University of Freiburg, Germany.

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|May 8, 2012
PubMed
Summary

Molded micro-axicons enable miniaturized optical coherence tomography (OCT) systems. These micro-optical components maintain a large depth of focus, crucial for endoscopic applications.

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Area of Science:

  • Optics and Photonics
  • Biomedical Imaging
  • Micro-optics

Background:

  • Bessel beams offer self-reconstruction and extended depth of focus in imaging.
  • Axicons are key components for generating Bessel beams.
  • Miniaturization of imaging systems like optical coherence tomography (OCT) necessitates micro-scale optical elements.

Purpose of the Study:

  • To design, fabricate, and demonstrate the application of molded micro-axicons.
  • To optimize depth of focus in miniaturized OCT systems using micro-axicons.
  • To achieve shorter optical system lengths compared to traditional micro-optics.

Main Methods:

  • Fabrication of molded micro-axicons for silicon-based micro-optical benches.
  • Implementation of multiple convex and concave micro-axicons.
  • Utilizing a telescopic optical arrangement within a miniaturized OCT system.

Main Results:

  • Successful design and fabrication of functional molded micro-axicons.
  • Demonstrated optimization of depth of focus in a miniaturized OCT system.
  • Achieved a significantly shorter optical system length using micro-axicon arrangements.

Conclusions:

  • Molded micro-axicons are effective for miniaturized OCT systems.
  • Micro-axicon arrangements can enhance imaging performance by extending depth of focus.
  • This approach offers a compact and efficient solution for endoscopic OCT.