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Electrooptic coefficients in calcium pyroniobate.

R D Rosner, E H Turner

    Applied Optics
    |January 12, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Electrooptic coefficients were measured in calcium pyroniobate, a low symmetry crystal. While some coefficients show promise for optical modulators, other properties limit its use.

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    Area of Science:

    • Materials Science
    • Optoelectronics
    • Crystallography

    Background:

    • Linear electrooptic coefficients describe how a material's refractive index changes under an electric field.
    • Low symmetry crystals present unique challenges for electrooptic characterization.
    • Calcium pyroniobate (Ca2Nb2O7) is a crystal with C(2) symmetry.

    Purpose of the Study:

    • To measure six of the eight linear electrooptic coefficients in a C(2) class calcium pyroniobate crystal.
    • To explore the potential of this material for optical modulator applications.
    • To detail the experimental geometries and methods for determining the relative signs of electrooptic coefficients.

    Main Methods:

    • Experimental measurement of six linear electrooptic coefficients.
    • Application of electric fields to the calcium pyroniobate crystal.
    • Optical techniques to detect field-induced refractive index changes.
    • Detailed discussion of measurement geometries for skew coefficients.

    Main Results:

    • Successfully measured six out of eight linear electrooptic coefficients in calcium pyroniobate.
    • Identified coefficients large enough for potential use in optical modulators.
    • Observed that other material properties may make it less suitable than existing modulator crystals.
    • Provided detailed insights into measurement techniques for low symmetry crystals.

    Conclusions:

    • Calcium pyroniobate exhibits significant electrooptic effects, suggesting potential for optical modulator applications.
    • Despite promising electrooptic coefficients, practical application is hindered by other material characteristics.
    • The study advances electrooptic characterization methods for low symmetry crystals.