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Related Concept Videos

Doppler Effect - I00:56

Doppler Effect - I

The Doppler effect and Doppler shift were named after the Austrian physicist and mathematician Christian Johann Doppler in 1842, who conducted experiments with both moving sources and moving observers. Consider an observer standing on a street corner, observing an ambulance with a siren sound passing by at a constant speed. The observer experiences two characteristic changes in the sound of the siren. Initially, the sound increases in loudness as the ambulance approaches and decreases in...
Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para position.
Doppler Effect - II01:05

Doppler Effect - II

The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
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,...

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Related Experiment Video

Updated: Jun 9, 2026

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
11:34

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

Published on: May 15, 2017

Dye lasers: introduction by the feature editors.

F J Duarte, J A Paisner, A Penzkofer

    Applied Optics
    |August 31, 2010
    PubMed
    Summary

    This special issue explores recent advancements in dye laser research. It offers a comprehensive overview of current trends and innovations in the field of optical technologies.

    Area of Science:

    • Optics and Photonics
    • Laser Technology

    Background:

    • Dye lasers are tunable coherent light sources with broad applications.
    • Continuous innovation is crucial for advancing laser technology.

    Purpose of the Study:

    • To present a perspective on recent trends in dye laser research.
    • To highlight key developments and future directions in the field.

    Main Methods:

    • This special issue compiles research articles and reviews.
    • Expert contributions offer insights into the latest advancements.

    Main Results:

    • The issue covers emerging trends in dye laser design and application.
    • New research indicates significant progress in efficiency and tunability.

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    Last Updated: Jun 9, 2026

    Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
    11:34

    Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

    Published on: May 15, 2017

    Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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    Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

    Published on: April 24, 2014

    Laser-induced Forward Transfer for Flip-chip Packaging of Single Dies
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    Published on: March 20, 2015

    Conclusions:

    • Dye laser research remains a dynamic and evolving field.
    • Continued exploration promises further breakthroughs in optical sciences.