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    This study enhances the Faraday effect in optical isolators using multipass cells. This allows weak Faraday materials to achieve the necessary 45° polarization rotation for isolator applications.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Traditional Faraday isolators rely on materials with high Verdet constants.
    • Materials with weak Faraday effects are typically unsuitable for optical isolator applications.

    Purpose of the Study:

    • To develop a method for achieving a 45° polarization rotation using materials with weak Faraday effects.
    • To expand the range of usable materials for optical isolators, particularly those with favorable thermo-optical properties in the UV and mid-infrared.

    Main Methods:

    • Employing a Herriott-type multipass cell to increase the effective path length of light through the Faraday medium.
    • Accumulating polarization rotation angle over multiple passes to reach the target 45° rotation.
    • Utilizing standard-sized optical materials and a neodymium ring magnet.

    Main Results:

    • Demonstrated a 45° polarization rotation of a 532 nm laser beam.
    • Successfully used anti-reflection-coated fused silica, a material with a weak Faraday effect.
    • Proof-of-principle experiment confirmed the feasibility of the multipass approach.

    Conclusions:

    • The multipass cell technique effectively enhances the Faraday effect, enabling the use of weak Faraday materials in optical isolators.
    • This method broadens the material selection for optical isolators, potentially improving performance and cost-effectiveness.
    • The approach is compatible with existing optical materials and standard magnet configurations.