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Related Concept Videos

Classification of Skeletal Muscle Fibers01:48

Classification of Skeletal Muscle Fibers

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Skeletal muscles continuously produce ATP to provide the energy that enables muscle contractions. Skeletal muscle fibers can be categorized into three types based on differences in their contraction speed and how they produce ATP, as well as physical differences related to these factors. Most human muscles contain all three muscle fiber types, albeit in varying proportions.
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Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
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Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
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Related Experiment Video

Updated: Jan 28, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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High-performance tunable, self-similar fiber laser.

Chunyang Ma, Ankita Khanolkar, Andy Chong

    Optics Letters
    |March 2, 2019
    PubMed
    Summary

    This study demonstrates a tunable mode-locked fiber laser with a Ytterbium gain medium. The laser achieves wavelength tuning from 1030 to 1100 nm while maintaining stable ultrashort pulses.

    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Materials Science

    Background:

    • Mode-locked fiber lasers are crucial for generating ultrashort optical pulses.
    • Yb-doped fiber lasers offer efficient operation in the near-infrared spectrum.
    • Achieving broad wavelength tunability without sacrificing pulse quality remains a challenge.

    Purpose of the Study:

    • To investigate the tunability of a mode-locked Ytterbium-doped self-similar fiber laser.
    • To optimize wavelength selection while maintaining stable mode-locking and high-quality pulse generation.
    • To suppress amplified spontaneous emission (ASE) for improved laser performance.

    Main Methods:

    • Utilized a narrow intracavity spectral filter to achieve wavelength tuning.
    • Employed a self-similar pulse evolution mechanism for stable mode-locking.

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  • Heated the gain fiber to suppress amplified spontaneous emission (ASE).

    • Main Results:

    • Demonstrated wavelength tunability from 1030 nm to 1100 nm.
    • Maintained stable mode-locking across the entire tuning range.
    • Achieved exceptional performance with pulse durations of approximately 100 fs and pulse energies of around 4 nJ.
    • Successfully suppressed amplified spontaneous emission (ASE) through controlled heating.

    Conclusions:

    • The Yb-doped self-similar fiber laser exhibits remarkable tunability and performance.
    • The self-similar pulse evolution is key to achieving high-quality ultrashort pulses over a broad spectral range.
    • This tunable laser system holds promise for various applications requiring adaptable ultrashort pulse sources.