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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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Related Experiment Video

Updated: Jun 20, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

Published on: November 22, 2019

Four-photon fiber laser.

W Margulis, U Osterberg

    Optics Letters
    |September 11, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Strong infrared optical signals were generated using phase-matched four-photon mixing in a short single-mode glass fiber. This process, driven by neodymium-doped yttrium aluminum garnet (Nd:YAG) laser light, also produced stimulated gain and laser action.

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    Femtosecond Laser Filaments for Use in Sub-Diffraction-Limited Imaging and Remote Sensing

    Published on: April 25, 2019

    Area of Science:

    • Nonlinear Optics
    • Fiber Optics
    • Laser Physics

    Background:

    • Neodymium-doped yttrium aluminum garnet (Nd:YAG) lasers are widely used for generating specific wavelengths.
    • Single-mode glass fibers offer unique properties for light manipulation and signal generation.
    • Four-photon mixing is a nonlinear optical process that can generate new wavelengths from input light.

    Purpose of the Study:

    • To investigate the generation of infrared optical signals via phase-matched four-photon mixing.
    • To explore the potential of short single-mode glass fibers for nonlinear optical processes.
    • To achieve stimulated gain and laser action using fiber-based nonlinear optics.

    Main Methods:

    • Coupling Nd:YAG laser light into a short piece of single-mode glass fiber (<4-m).
    • Utilizing phase-matched four-photon mixing to generate new optical signals.
    • Employing an external cavity to observe stimulated gain and laser action.

    Main Results:

    • Strong infrared optical signals were successfully produced at 0.991 and 1.149 micrometers.
    • Evidence of stimulated gain was observed within the fiber.
    • Laser action was achieved with the fiber placed in an external cavity.

    Conclusions:

    • Short single-mode glass fibers can efficiently generate strong infrared signals through phase-matched four-photon mixing.
    • The experimental setup demonstrated the feasibility of achieving stimulated gain and laser action in this configuration.
    • This work highlights the potential of fiber-based nonlinear optics for generating specific optical wavelengths.