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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: May 7, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

Efficient method for controlling the spatial coherence of a laser.

M Nixon, B Redding, A A Friesem

    Optics Letters
    |October 2, 2013
    PubMed
    Summary
    This summary is machine-generated.

    We present a method to control laser spatial coherence by adjusting a spatial filter, enabling bright, speckle-free microscopy illumination. This technique tunes lasing modes with minimal power variation.

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    Published on: November 22, 2019

    Area of Science:

    • Laser physics
    • Optical engineering
    • Microscopy

    Background:

    • Spatial coherence is crucial for applications like microscopy.
    • Controlling spatial coherence in lasers often involves trade-offs with output power.
    • Degenerate lasers offer potential for tunable coherence.

    Purpose of the Study:

    • To develop an efficient method for tuning the spatial coherence of a degenerate laser.
    • To minimize output power variation during coherence tuning.
    • To explore the application of tunable coherence lasers in microscopy.

    Main Methods:

    • Implementing a spatial filter with adjustable diameter within the laser cavity.
    • Varying the spatial filter diameter to control the number of supported lasing modes.
    • Measuring spatial coherence and total output power.

    Main Results:

    • Achieved broad-range tuning of spatial coherence in a degenerate laser.
    • Controlled the number of lasing modes from 1 to 320,000.
    • Maintained output power with less than 50% variation during tuning.
    • Demonstrated a low spatial coherence degenerate laser as a bright, speckle-free microscopy source.

    Conclusions:

    • The spatial filter method provides effective control over degenerate laser spatial coherence.
    • The tunable coherence laser is suitable for high-brightness, speckle-free microscopy.
    • This technique advances laser control for advanced optical applications.