LiTaO3 EO Crystal
LiTaO3 is an E-O crystal widely used for E-O devices, due to its good optical NLO and E-O properties, as well as high damage threshold. CASTECH supplies high quality LiTaO3 boules and wafers with the following specifications for standard applications. We can also offer other specifications upon request.
Basic Properties：
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Crystal Structure
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Trigonal, Space group R3c, Point group 3m
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Cell Parameters
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a=5.154Å，c=13.781Å
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Melting Point
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1650℃
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Curie Temperature
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607℃
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Mohs Hardness
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5.5
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Density
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7.46g/cm3
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Dielectric Constants
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ε11/ε0：51.7
ε33/ε0：44.5
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Elastic Stiffness Coefficients
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CE11：2.33（×1011N/m2）
CE33：2.77（×1011N/m2）
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Piezoelectric Strain Constants
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d22：2.4（×10-11C/N）
d33：0.8（×10-11C/N）
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Transmission range
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400-4500nm
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Electro-optical coefficients
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r33=30.4pm/V
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Refractive index at 632.8nm
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no=2.176，ne=2.180
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Typical Specifications：
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Type Specifications
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Boule
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Wafer
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Diameter
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Φ3″
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Φ3″
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Φ4″
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Length or Thickness
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≤100mm
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≤50mm
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0.35-0.5mm
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Orientation
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127.86°Y，64°Y，135°Y，X，Y，Z，and other cut
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Ref. Flat Orientation
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X，Y
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Ref. Flat Length
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22±2mm
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2mm
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22±2mm
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32±2mm
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Front Side Polishing
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Mirror polished 5-15Å
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Back Side Lapping
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0.3-1.0μm
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Flatness（μm）
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≤15
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Bow（μm）
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≤25
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