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Related Concept Videos

Induced Electric Fields: Applications01:27

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An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
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Atoms generally contain the same number of positively and negatively charged particles, protons, and electrons. Hence, they are electrically neutral. However, the centers of the positive and negative charges do not always coincide. In such a scenario, the electric field of an atom may not be zero.
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2m-distance external cavity VECSEL for wireless charging applications.

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    Researchers achieved laser generation in a 200 cm air cavity using optical-pumped semiconductor gain chips. This breakthrough enables stable laser wireless charging, even with slight mirror misalignment.

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    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers
    • Wireless Power Transfer

    Background:

    • Laser generation typically requires stable, short cavities.
    • Optical-pumped semiconductor gain chips offer efficient laser operation.
    • Laser wireless charging demands robust and easily alignable laser sources.

    Purpose of the Study:

    • To demonstrate laser generation in an ultralong external air cavity.
    • To evaluate the feasibility of such a system for laser wireless charging.
    • To assess the stability and alignment tolerance of the generated laser.

    Main Methods:

    • Utilizing an optical-pumped semiconductor gain chip.
    • Constructing an ultralong external air cavity (200 cm).
    • Characterizing laser output power and oscillation stability under misalignment.

    Main Results:

    • Achieved laser generation in a 200 cm air cavity, a first for this configuration.
    • Obtained a maximum output laser power exceeding 86.3 mW.
    • Demonstrated sustained laser oscillation with the output mirror up to 1.6 cm off-axis.

    Conclusions:

    • Ultralong external air cavities are viable for laser generation.
    • The demonstrated system offers enhanced alignment tolerance, crucial for laser wireless charging.
    • This approach simplifies the integration of laser systems for wireless power applications.