LiTaO3 crystal belongs to 3m crystal system. The transverse
electro-optic modulation of the crystal can be used to measure the
electric field. LiTaO3 has excellent electro-optic properties, it
has higher electro-optic coefficient than LiNbO3, higher optical
damage threshold, lower birefringence, wide transmission band, and
high light transmittance. The crystals produced by different
crystal growth methods have different optical damage thresholds,
the LiTaO3 crystal prepared by top-seeded solution method is one
order of magnitude higher than that of the same component crystal.
As an electro-optical crystal for measuring an electric field,
LiTaO3 is widely used because of its large electro-optic
coefficient, which makes it highly sensitive in measurement ,and
the wafer fabrication cost is low.
Physical and Chemical Properties
Point group | C3v-3m |
Refractive index at 632.8nm | n0=2.176 |
ne=2.186 |
Transparent Range | 0.4-5.0m |
Orientation | X,Z,36°Y,42°Y,128°Y |
Melting point | 1650℃ |
Density | 7.45g/cm3 |
Mohs hardness | 5.5 |
Thermal expansion coefficient | aa=16×10-6/K, ac=4×10-6/K |
Specific heat | 0.06J/(kg°C) |
Cell Parameters | a=5.154,c=13.781 |
Curie Temperature | 605℃ |
Elastic Stiffness Coefficient | CE11=2.33(×1011N/m2) |
CE33=2.77(×1011N/m2) |
Electro-optical coefficients@0.63m | S13=7×10-12m/V |
S33=30.3×10-12m/V |
Heat Capacity (Cp) | 100 J / k.mol |
Typical Optical Properties
Electro-Optic Coefficients r(10-12 mV-1) at 632.8 nm
rT13 | 8.4 | rS13 | 7 |
rT22 | | rS22 | 1 |
rT33 | 30.5 | rS33 | 30.3 |
rT51 | | rS51 | 20 |
Nonlinear Optical Coefficients at 1-06 m (*d31=d15)
d22 / l d36KDP l | 4.4 |
d31 / l d36KDP l | -2.7 |
d33 / l d36KDP l | -4.1 |
Refractive Index at 632.8 nm
no | 2.1787 |
ne | 2.1821 |
no: TE modene: TM mode |
Typical Acoustic Properties
Surface Acoustic Wave Properties
Description | Propagation | Design | Surface Wave Velocity (m/s) | Coupling Coefficient k (%) | Group Delay Time Temp Coefficient (ppm/°C) |
36Y Cut | X Axis | SSBW | 4160 | 5 | |