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Related Concept Videos

Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
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...
Fluorescence and Phosphorescence: Instrumentation01:25

Fluorescence and Phosphorescence: Instrumentation

Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.
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.
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,...
Total Internal Reflection Fluorescence Microscopy01:05

Total Internal Reflection Fluorescence Microscopy

Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.

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Related Experiment Video

Updated: May 10, 2026

Dissection and 2-Photon Imaging of Peripheral Lymph Nodes in Mice
16:48

Dissection and 2-Photon Imaging of Peripheral Lymph Nodes in Mice

Published on: August 23, 2007

High visibility two-photon interference with classical light.

Peilong Hong1, Lei Xu, Zhaohui Zhai

  • 1The MOE Key Laboratory of Weak Light Nonlinear Photonics and School of Physics, Nankai University, Tianjin 300457, China.

Optics Express
|June 22, 2013
PubMed
Summary
This summary is machine-generated.

Researchers enhanced two-photon interference visibility beyond 50% using a random-phase grating. This method controls high-order coherence in classical light by superposing multiple indistinguishable two-photon paths.

More Related Videos

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Related Experiment Videos

Last Updated: May 10, 2026

Dissection and 2-Photon Imaging of Peripheral Lymph Nodes in Mice
16:48

Dissection and 2-Photon Imaging of Peripheral Lymph Nodes in Mice

Published on: August 23, 2007

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Area of Science:

  • Quantum optics
  • Classical light coherence

Background:

  • Two-photon interference with independent classical sources typically shows limited visibility (max 50%).
  • This limitation arises from the superposition of only two indistinguishable two-photon paths.

Purpose of the Study:

  • To enhance the visibility of two-photon interference effects.
  • To explore methods for controlling high-order coherence in classical light.

Main Methods:

  • Utilizing a random-phase grating to modulate the wavefront of coherent light.
  • Introducing superposition of multiple indistinguishable two-photon paths.

Main Results:

  • Achieved two-photon interference visibility exceeding the classical 50% limit.
  • Demonstrated enhanced interference by superposing multiple paths.

Conclusions:

  • Phase control is crucial for manipulating high-order coherence in classical light.
  • The random-phase grating technique offers a pathway to improved two-photon interference.