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Confocal Fluorescence Microscopy01:16

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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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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Multi-channel, multi-resolution random-modulated pulsed lidar.

Cheng-Ting Lee, Chih-Hsieh Wang, Fan-Yi Lin

    Optics Express
    |June 11, 2026
    PubMed
    Summary
    This summary is machine-generated.

    A novel random-modulated pulsed lidar system achieves multi-channel, multi-resolution 3D imaging. This system uses a single laser source to enable tunable spectral distributions for precise ranging across various detector bandwidths.

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    Area of Science:

    • Optical Engineering
    • Laser Technology
    • Remote Sensing

    Background:

    • Developing advanced lidar systems for high-resolution 3D imaging is crucial for various applications.
    • Existing lidar technologies often face limitations in achieving both multi-channel capabilities and variable ranging resolutions simultaneously from a single source.

    Purpose of the Study:

    • To present a novel multi-channel, multi-resolution random-modulated pulsed lidar system.
    • To demonstrate the system's capability for tunable spectral distributions and efficient spectral coupling to detectors with varying bandwidths.
    • To achieve precise 3D imaging with multiple ranging resolutions.

    Main Methods:

    • Utilized a multimode gain-switched Fabry-Pérot (FP) semiconductor laser.
    • Incorporated a delay self-homodyne interferometer (DSHI) and dense wavelength-division multiplexing (DWDM).
    • Controlled injection current, DWDM channels, and DSHI delay length to generate multi-channel random-modulated pulses.

    Main Results:

    • Generated multi-channel random-modulated pulses with tunable spectral distributions from a single laser.
    • Identified three optimized configurations for detectors with 250 MHz, 400 MHz, and 1.6 GHz bandwidths.
    • Demonstrated multi-channel, multi-resolution 3D imaging with ranging precisions of 4.8 mm, 1.1 mm, and 0.1 mm.

    Conclusions:

    • The developed lidar system successfully enables multi-channel, multi-resolution 3D imaging.
    • The system's design allows for efficient spectral coupling and adaptable ranging resolutions based on detector bandwidth.
    • Achieved high ranging precisions, showcasing the system's potential for advanced remote sensing applications.