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        • Product name: LiNbO3
        • Product ID: 123
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        description:

        LiNbO3 Crystal
        LiNbO3 is widely used as electro-optic modulators and Q-switches for Nd:YAG, Nd:YLF and Ti:Sapphire lasers as well as modulators for fiber optics. The following table list the specifications of a typical LiNbO3 crystal used as Q-switch with transverse E-O modulation. The light propagates in z-axis and electric field applies to x-axis. The electro-optic coefficients of LiNbO3 are: r33 = 32 pm/V, r31 = 10 pm/V, r22 = 6.8 pm/V at low frequency and r33 = 31 pm/V, r31= 8.6 pm/V, r22 = 3.4 pm/V at high electric frequency. The half–wave voltage: Vπ=λd/(2no3r22L), r c=(ne/no)3r33-r13.

        LiNbO3 Q-Switch Specifications

        Size

        9 X 9 X 25 mm3 or 4 X 4 X 15 mm3
        Other size is available upon request
        Tolerance of size Z-axis: ± 0.2 mm
        X-axis and Y-axis:±0.1 mm
        Chamfer less than 0.5 mm at 45°  
        Accuracy of orientation Z-axis: <± 5’
        X-axis and Y-axis: < ± 10’
        Parallelism < 20"
        Finish 10/5 scratch/dig
        Flatness λ/8 at 633 nm
        AR-coating R < 0.2% @ 1064 nm
        Electrodes Gold/Chrome plated on X-faces
        Wavefront distortion <λ/4 @ 633 nm
        Extinction ratio > 400:1 @ 633 nm, φ6 mm beam

        LiNbO3 is also a good acousto-optic crystal and used for surface acoustic wave (SAW) wafer and A-O modulators. CASTECH provides acoustic (SAW) grade LiNbO3 crystals in wafers, as-cut boules, finished components and custom fabricated elements.

        Typical SAW Properties

        Cut Type

        SAW Velocity
        Vs (m/s)

        Electromechanical Coupling Factor
        k2s (%)

        Temperature Coefficient of Velocity
        TCV (10-6/oC)

        Temperature Coefficient of Delay
        TCD (10-6/oC)

        127.86o Y-X

        3970

        5.5

        -60

        78

        Y-X

        3485

        4.3

        -85

        95

        Typical Specifications

        Type Specifications

        Boule

        Wafer

        Diameter

        Φ3"

        Φ4"

        Φ3"

        Φ4"

        Length or Thickness(mm)

        ≤100

        ≤50

        0.35-0.5

        Orientation

        127.86°Y, 64°Y, 135°Y, X, Y, Z, and other cut

        Ref. Flat Orientation

                      X,  Y

        Ref. Flat Length

        22±2mm

        32±2mm

        22±2mm

        32±2mm

        Front Side Polishing

         

        Mirror polished 5-15 Å

        Back Side Lapping

         

        0.3-1.0 mm

        Flatness (mm)

         

        15

        Bow (mm)

         

        25

        CASTECH can offer other sizes and specifications of wafers upon request.