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Related Concept Videos

Group Polarization01:01

Group Polarization

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Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition.
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Potential Due to a Polarized Object01:29

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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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Related Experiment Video

Updated: Oct 17, 2025

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Supercontinuum generated in an all-polarization-maintaining random fiber laser structure.

Jiuru He, Rui Song, Li Jiang

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    Summary

    Researchers developed a linearly-polarized supercontinuum (SC) using a novel random fiber laser (RFL). This method enhances bandwidth and spectral flatness, offering a cost-effective solution for SC generation.

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    Area of Science:

    • Photonics
    • Laser Physics
    • Materials Science

    Background:

    • Supercontinuum (SC) generation is crucial for various optical applications.
    • Traditional SC generation often lacks polarization control.
    • Random Fiber Lasers (RFLs) offer a unique platform for light generation.

    Purpose of the Study:

    • To demonstrate the direct generation of a linearly-polarized supercontinuum (SC) from an all-polarization-maintaining random fiber laser (RFL).
    • To investigate the impact of polarization-maintaining germanium doped fiber (GDF) on SC spectral properties.
    • To provide a cost-effective and simple method for producing linearly-polarized SC.

    Main Methods:

    • Utilized an all-polarization-maintaining random fiber laser (RFL) structure.
    • Employed polarization-maintaining germanium doped fiber (GDF) to leverage its high Raman gain.
    • Characterized the output SC spectrum, power, and polarization extinction ratio (PER).

    Main Results:

    • Achieved direct generation of a linearly-polarized SC from the RFL.
    • Observed enhanced bandwidth and spectral flatness due to GDF's Raman gain.
    • Output SC power averaged 4.43 W, spanning 600 nm to 1900 nm.
    • Measured a polarization extinction ratio (PER) > 18 dB between 800 nm and 1700 nm.

    Conclusions:

    • This study presents the first demonstration of a linearly-polarized SC directly from an RFL.
    • The use of polarization-maintaining GDF significantly improves SC bandwidth and flatness.
    • This work offers a practical, simple, and cost-effective approach for linearly-polarized SC generation.