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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 22, 2026

Laser-induced Breakdown Spectroscopy: A New Approach for Nanoparticle's Mapping and Quantification in Organ Tissue
10:17

Laser-induced Breakdown Spectroscopy: A New Approach for Nanoparticle's Mapping and Quantification in Organ Tissue

Published on: June 18, 2014

Active, LCoS based laser interferometer for microelements studies.

Jacek Kacperski, Malgorzata Kujawinska

    Optics Express
    |June 17, 2009
    PubMed
    Summary

    This study enhances the Twyman-Green interferometer using a Liquid Crystal on Silicon (LCoS) spatial light modulator for precise microelement shape and deformation measurements. The LCoS enables arbitrary phase control, improving measurement accuracy and range.

    Area of Science:

    • Optical metrology
    • Interferometry
    • Micro-optics

    Background:

    • Classical Twyman-Green interferometers lack dynamic phase control.
    • Measuring microelement deformation requires advanced interferometric techniques.

    Purpose of the Study:

    • To modify the Twyman-Green interferometer using a Liquid Crystal on Silicon (LCoS) spatial light modulator.
    • To enable arbitrary phase control in the reference wavefront for enhanced microelement analysis.

    Main Methods:

    • Implementation of an LCoS spatial light modulator as the reference mirror.
    • Introduction of spatial carrier frequency and wavefront deformation compensation.
    • Calibration and error analysis of the LCoS display for phase shifting.

    Main Results:

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    • Demonstrated arbitrary phase control in the reference wavefront.
    • Extended measurement range for microelement shape and deformation.
    • Experimental confirmation of LCoS-based interferometer for silicon micromembranes.

    Conclusions:

    • LCoS-based interferometers offer versatile phase manipulation for microelement metrology.
    • The system facilitates accurate shape determination and transient deformation monitoring.
    • Error analysis and calibration are crucial for precise LCoS phase shifting.