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Single-path electro-optic coefficients measurement approach using multiple reflection interference.

Weigang Zhao, Hui Chen, Xiaotian Fu

    Applied Optics
    |November 22, 2021
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    Summary
    This summary is machine-generated.

    This study introduces a novel interferometer for precisely measuring electro-optic coefficients (EOCs) in optical crystals. The method enhances accuracy and repeatability, yielding key EOC values for lithium niobate crystals.

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    Area of Science:

    • Materials Science
    • Optics and Photonics
    • Solid State Physics

    Background:

    • Electro-optic coefficients (EOCs) are critical material properties governing the interaction of light with electric fields in optical crystals.
    • Precise measurement of EOCs is essential for developing advanced optical devices.
    • Existing methods may face limitations in accuracy, repeatability, or sensitivity to experimental conditions.

    Purpose of the Study:

    • To propose and validate a novel single-path multiple reflection interferometer for high-precision measurement of signed EOCs.
    • To improve the accuracy and repeatability of EOC measurements by mitigating the influence of incident light.
    • To determine the specific EOC components (γ31 and γ33) of a congruent Lithium Niobate (LiNbO3) crystal.

    Main Methods:

    • Development of a single-path multiple reflection interferometer setup.
    • Implementation of a normalization method to correct for variations in incident light intensity.
    • Experimental determination of signed EOCs under a small external electric field.

    Main Results:

    • The proposed interferometer achieved high precision in measuring signed EOCs.
    • The normalization method effectively removed the influence of incident light, enhancing experimental repeatability.
    • The signed EOCs for congruent LiNbO3 were determined as γ31 = +9.6 ± 0.3 pm/V and γ33 = +29.5 ± 0.5 pm/V.

    Conclusions:

    • The developed interferometer offers a reliable and precise method for measuring signed EOCs.
    • The obtained EOC values for LiNbO3 provide crucial data for material characterization.
    • This research contributes to the advancement of anisotropic optical crystal devices.