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Lithium Tantalate exhibits unique electro-optical, pyroelectric and
piezoelectric properties combined with good mechanical and chemical
stability and , wide transparency range and high optical damage
threshold. This makes LiTaO3 well-suited for numerous applications
including electro-optical modulators, pyroelectric detectors, optical
waveguide and SAW substrates, piezoelectric transducers etc. LiTaO3
crystals grown along X-axis, fully poled, maximum size 60 mm diameter
and length are available as alternative material for E-O modulators,
pyroelectric sensors, etc.
Material Properties
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Crystal
symmetry
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Trigonal, 3m
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Lattice constant, A
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a = 5.154 c = 13.783
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Density, g/cm3
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7.45
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Melting point , °C
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1650
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Curie point , °C
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610
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Mohs hardness
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6
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Solubility
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Insoluble in water
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Color
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Colorless or light yellow
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Thermal expansion coefficient, 10-6/ °C
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aa = 16 ac = 4
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Specific heat, cal/g°C
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0.06
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Thermal conductivity , mW/cm °C
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46
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Dielectric Constant (@ 100 KHz)
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ea = 54 ec = 43
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Transparency range, nm
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400 - 5500
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Refractive indices @ 633 nm
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no = 2.175 ne = 2.180
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Electro-optic coefficients
pm/V @633 nm, high frequency
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r33 = 33
r13 = 8
r22 = 20
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Nonlinear optical coefficients
p/m/V @ 1064 nm
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d22 = 2.0
d31 = - 1
d33 = -21
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Pyroelectric Coefficient:
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-2.3 10-4 C/°C/m2
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Optical homogeneity
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~10-5
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Absorption loss @ 1064 nm
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< 0.15 %/cm
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