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Lithium Tantalate (LiTaO3)

Lithium tantalite (LiTaO3) is similar to lithium niobate. Both are grown by the Czochralski method which yields large, high quality single crystals. Lithium tantalate possesses unique electro-optical, acoustic, piezoelectric and pyroelectric properties, which makes it attractive for numerous applications including electro-optical modulators, pyroelectric detectors, piezoelectric transducers and sensors. It has good mechanical and chemical stability, a wide transparency range and a high optical damage threshold.


  Crystal Structure Trigonal,3m
  lattice constant (Å) a = 5.154, c = 13.783
  Melting Point (°C) 1650
  Curie Point (°C) 607
  Mohs Hardness   ≈ 6
  Density (g/cm^3) 7.46
  Hygroscopic Susceptibility No
  Relative Dielectric Constant εT11 /εo= 51.5, εT33 /εo= 44.5
  Coefficient of Thermal Expansion  ( /°C)
||C: 4X10-6
C: 16X10-6
  Optical Homogeneity (/cm) ≈ 10-5
  Transmission Range (nm) 400 ~ 4500
  Damage Threshold (MW/cm2)
100  at 1064nm (10ns)  
  Refractive Indices no = 2.176, ne = 2.180 at 632.8nm
  Nonlinear Optical Coefficients (pm/V)
d31=-1.0, d33=-21.0, d22=2.0,
  Electro-optic Coefficients (pm/V at 633nm)
r33 = 35.8, r13 = 7, r22 = 1, r51=20 (high frequency)
  Table 1: LiTaO3 Properties

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