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Related Concept Videos

Confocal Fluorescence Microscopy01:16

Confocal Fluorescence Microscopy

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,...
Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.

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Simultaneous Label-Free Autofluorescence Multi-Harmonic Microscopy
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Published on: August 29, 2025

Nonlinear absorption microscopy.

Tong Ye1, Dan Fu, Warren S Warren

  • 1Department of Neurobiology, Evelyn F. McKnight Brain Institute, University of Alabama at Birmingham, USA. tongye@uab.edu

Photochemistry and Photobiology
|January 28, 2009
PubMed
Summary
This summary is machine-generated.

Nonlinear absorption microscopy offers deep, high-resolution imaging of living tissues by adapting spectroscopy. This technique visualizes skin pigmentation and microvasculature with molecular specificity.

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Area of Science:

  • Biomedical Optics
  • Microscopy
  • Molecular Imaging

Background:

  • Nonlinear microscopy overcomes scattering in thick tissue imaging.
  • It provides high resolution and deep imaging for live tissues.
  • Novel contrast mechanisms offer molecular specificity.

Purpose of the Study:

  • To adapt nonlinear absorption spectroscopy into a microscopy imaging technique.
  • To introduce nonlinear absorption microscopy (NAM).
  • To review NAM principles, instrumentation, and applications.

Main Methods:

  • Utilizing nonlinear optical effects for signal generation.
  • Employing nonlinear absorption, where absorption depends on excitation intensity.
  • Developing instrumentation for NAM.

Main Results:

  • Demonstrated successful adaptation of spectroscopy to microscopy.
  • Developed a novel imaging modality: nonlinear absorption microscopy.
  • Applied NAM for imaging skin pigmentation and microvasculature.

Conclusions:

  • Nonlinear absorption microscopy is a powerful new tool for biological imaging.
  • It enables molecularly specific contrast in thick tissues.
  • NAM shows promise for both ex vivo and in vivo studies.