Lithium Tantalate
LiTaO3
Lithium tantalate (LiTaO3) possesses 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.
Optical and spectral 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 | |
|---|---|
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sample thickness: 1 mm | |
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