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    LiNbO3

    LiNbO3 crystal combines low cost, good mechanical and physical properties as well as high optical homogeneity. Therefore, LiNbO3 wedges have been widely used in fiber isolators and circulators.
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    CASTECH provides:

    ?  50,000 to 100,000 pcs/month of LiNbO3 wedges used for fiber optical isolators and circulators;
    ?  Reliable Delivery;
    ?  Strict quality control;
    ?  Technical support;
    ?  Very competitive price.

     

    Table 1. Basic Properties of LiNbO3

    Crystal Structure Trigonal, Space group R3c, Point group 3m
    Melting Point 1253℃
    Mohs Hardness 5
    Density 4.64g/cm3
    Deliquescence None
    Optical Homogeneity ~5×10-5/cm
    Transparency Range 420nm-5200nm
    Absorption Coefficient ~0.1%/cm @ 1064nm
    Refractive indices at 1064nm ne  = 2.146, no = 2.220 @ 1300 nm
    ne  = 2.156, no = 2.232 @ 1064 nm
    n= 2.203, no = 2.286 @ 632.8 nm
    Thermal Expansion Coefficients(at 25℃) //a, 2.0×10-6/K
    //c, 2.2×10-6/K
    Thermal Conductivity Coefficient 38 W/m/K at 25℃
    Thermal Optical Coefficient dno/dT=-0.874×10-6/K at 1.4 μm
    dne/dT=39.073×10-6/K at 1.4 μm
    The Sellmeier equations(λ in μm) no2 = 4.9048 + 0.11768/(λ2-0.04750) - 0.027169λ2
    ne2 = 4.5820 + 0.099169/(λ2-0.04443) - 0.02195λ2

     

    Table 2. Specifications of LiNbO3 wedges

    Aperture 1.0×1.0 mm to  4×4 mm2
    Dimension tolerance ±0.05mm
    Wedge Angle tolerance ±0.1°
    Optical axis orientation ±0.5°
    Flatness λ/4 @ 632.8nm
    Surface Quality 20/10
    AR-coating R<0.2% @ 1550nm±40nm
    Standard Size 1.25mm×1.25mm×0.5mm with 13°  or 15° wedge,phi=22.5°

     

    Note: Other sizes and coatings are available upon request.

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