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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,...

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Updated: Jun 10, 2026

Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing
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Published on: April 25, 2019

Spatial coherence of KrF excimer lasers.

S Kawata, I Hikima, Y Ichihara

    Applied Optics
    |August 19, 2010
    PubMed
    Summary

    Researchers experimentally measured the spatial coherence and beam divergence of a KrF excimer laser. Results align with theoretical models, establishing a universal relationship between coherence and divergence for pulse lasers.

    Area of Science:

    • Laser Physics
    • Quantum Optics

    Background:

    • Understanding spatial coherence and beam divergence is crucial for laser applications.
    • Excimer lasers, like KrF, are important sources for various scientific and industrial processes.

    Purpose of the Study:

    • To experimentally determine the spatial coherence and beam divergence of a KrF excimer laser at 248 nm.
    • To theoretically investigate the relationship between spatial coherence and beam divergence.
    • To validate theoretical models with experimental data and assess their applicability to other pulse lasers.

    Main Methods:

    • Experimental measurement of spatial coherence and beam divergence at 248 nm using a KrF excimer laser.
    • Theoretical calculations employing a simple pulse-laser model and the van Cittert-Zernike theorem.

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  • Comparison of experimental results with theoretical predictions.

    • Main Results:

    • Experimental data for spatial coherence and beam divergence closely matched theoretical calculations.
    • A theoretical relationship between spatial coherence and beam divergence was derived, dependent only on wavelength.
    • This relationship was experimentally validated and shown to be independent of specific laser structure parameters.

    Conclusions:

    • The study successfully validated theoretical models for pulse laser beam characteristics.
    • A universal relationship between spatial coherence and beam divergence was established for pulse lasers.
    • The findings are applicable to a broad range of pulse laser systems.