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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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Related Experiment Video

Updated: Jun 12, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
08:48

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

Published on: November 22, 2019

Single-longitudinal-mode operation from a semiconductor laser array via feedback from a modified collimating

S Maccormack, R W Eason

    Applied Optics
    |June 23, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a method for single-mode laser output from a ten-stripe diode array. This technique uses modified microscope objective feedback to achieve a 14 dB main-to-side mode ratio.

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    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers

    Background:

    • Laser diode arrays are crucial for high-power applications.
    • Achieving single-longitudinal-mode operation in laser diode arrays is challenging.
    • Existing methods often lack efficiency or require complex setups.

    Purpose of the Study:

    • To present a novel technique for single-longitudinal-mode output from a ten-stripe laser diode array.
    • To optimize the feedback mechanism for improved mode selectivity.
    • To demonstrate the effectiveness of a modified microscope objective for beam collimation and feedback.

    Main Methods:

    • Utilized a ten-stripe laser diode array.
    • Implemented a single modified microscope objective for optical feedback.
    • Varied feedback reflectivity to determine optimal conditions.
    • Measured the main mode to side mode ratio.

    Main Results:

    • Successfully obtained single-longitudinal-mode collimated output.
    • Achieved an optimum main mode to side mode ratio of 14 dB.
    • Identified an optimal feedback reflectivity of 10% for maximum mode suppression.

    Conclusions:

    • The described technique effectively enables single-longitudinal-mode operation in ten-stripe laser diode arrays.
    • A modified microscope objective serves as an efficient feedback element for mode control.
    • This method offers a practical approach for enhancing laser diode array performance.