Lithium Tantalate

Material
LiTaO3

 

Lithium tantalate (LiTaO3possesses a combination of unique electro-optical, piezoelectric and pyroelectric properties with good mechanical and chemical stability, wide transparency range (0.4µm - 5.0µm) and high optical damage threshold.

 

Lithium Tantalate is a widely used electro-optical material. Its optical, electro-optical and non-linear optical properties are similar to Lithium Niobate (large effective non-linear, electro-optic and acousto-optic coefficients), but Lithium Tantalate possesses higher damage threshold (>500MW/cm2 for ns pulsed).

 

Lithium Tantalate is commonly used in non-linear optics, electro-optical modulators, pyroelectric detectors, passive infrared sensors such as motion detectors, terahertz generation and detection, cell phones and possibly pyroelectric nuclear fusion.

Properties
Optical properties
Transmission range in nm (minimum 10%)
275 ‐ 5250
Refractive index @633 nm
ne=2,139

no=2,139

Reflection losses in % at 1 surface @ 633 nm
13,7
optical homogeneity in 1/cm
10-5
NLO coefficients in pm/V @1064 nm
d33= -21

d31= -1

d22= 2

Damage threshold in MW/cm2 (10ns)
200
Absorption loss in %/cm @1064 nm
< 0,15
Physical properties
Density in g/cm3
7,46
Melting point in °C
1650
Specific heat capacity in J/(kg · K)
424
Thermal conductivity in W/(m · °C)
4,6
Thermal expansion in 1/K @25°C
16 · 10-6 (⊥ c-axis)

2 · 10-6 (∥ c-axis)

Dielectric constant @298K, 100kH
41-53
Solubility in water in g/100g
insoluble
Mohs hardness
6
Knoop hardness in kg/mm²
750
Material type
single crystalline, synthetic
Crystal structure
trigonal
Lattice constants in Å
a = 5,15

c = 13,77

Elastic coefficient in GPa
C11 = 230

C12 = 42

C13 = 79

C14 = -11

C33 = 276

C44 = 95,9

Spectral properties
sample thickness: 1 mm