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Related Concept Videos

Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
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In electrostatics, the electric field can be written as the negative gradient of the potential. In magnetostatics, the zero divergence of the magnetic field ensures that the magnetic field can be expressed as the curl of a vector potential. This potential is known as the magnetic vector potential.
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Related Experiment Video

Updated: Aug 25, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Polarization attractors driven by vector soliton rain.

Sergey V Sergeyev, Mahmoud Eliwa, Hani Kbashi

    Optics Express
    |October 19, 2022
    PubMed
    Summary

    Researchers demonstrate a new controllable polarization attractor in fiber lasers using vector soliton rain. This discovery allows manipulation of complex pulse dynamics for advanced laser applications.

    Area of Science:

    • Laser Physics
    • Nonlinear Optics
    • Fiber Optics

    Background:

    • Soliton rain, characterized by small soliton pulses near a main pulse, is a complex phenomenon in mode-locked lasers.
    • Controlling multisoliton dynamics is crucial for advancing laser technology and applications.

    Purpose of the Study:

    • To experimentally and theoretically demonstrate a novel type of polarization attractor.
    • To show that vector soliton rain can control these attractors.
    • To investigate the transformation of polarization states on the Poincaré sphere.

    Main Methods:

    • Utilizing an Erbium-doped fiber laser mode-locked with carbon nanotubes.
    • Employing experimental observations and theoretical analysis.
    • Adjusting pump power to control vector soliton rain and polarization states.

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    Main Results:

    • A new type of polarization attractor controllable by vector soliton rain was demonstrated for the first time.
    • Vector soliton rain exhibited rotating states of polarization.
    • Trajectories on the Poincaré sphere transformed from double-scroll spirals to circles.

    Conclusions:

    • Vector soliton rain offers a method to control complex multisoliton dynamics in fiber lasers.
    • The findings have potential applications in spectroscopy, metrology, and biomedical diagnostics.
    • This work advances the understanding and control of nonlinear phenomena in laser systems.