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LITHIUM NIOBATE, LiNbO3
Due to its unique electro-optical, photoelastic, piezoelectric and non-linear
properties Lithium Niobate is widely used in a variety of integrated and active
acousto-optical devices. The material is Czochralsky grown and poled along
Z-axis. Maximum available size: 80 mm diameter x 100 mm long. The near
stoichiometric composition and MgO doped crystals are also available (up to 60
mm diameter). Other available dopants: Fe, Zn, Gd, Cu, Y, B, Er.
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.)
Main Properties
(Congruent Melt- 48.6 mol.% LiO2)
| Chemical Formula |
LiNbO3 |
| Crystal Class |
Trigonal, 3m |
| Lattice Constant, Å |
a=5.148
c= 13.863 |
| Molecular Weight |
147.9 |
| Density, g/cm3 at 293 K |
4.644 |
| Transmittance Range, nm |
350-5500 |
Dielectric Constant at 100 KHz
ea (perpendicular),
ec (parallel) |
85, 29 |
| Melting Temperature, K |
1530 |
| Curie Temperature, K |
1415 |
| Thermal Conductivity, W/(m K) at 300 K |
5.6 |
Thermal Expansion, 1/K at 300 K
aa (perpendicular)
ac (parallel) |
15 x 10-6
5 x 10-6 |
| Specific Heat, cal/(g K) |
0.15 |
| Hardness (Mohs) |
~5 |
| Bandgap, eV |
4.0 |
| Solubility in water |
None |
| Color |
None |
Electro-Optical Coefficients, pm/V
at 633nm, high frequency |
r33=31
r31=9
r22=3.4 |
| SAW Velocity, m/s |
3490-3890 |
Nonlinear Optical Coefficients, p/m/V
at 1064 nm |
d31 = -4.5
d33 = -0.27
d22 = 2.1 |
Synchronism Width:
temperature, oC x cm
spectral, Å x cm
angle, mrad x cm |
0.6
2.3
47
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Optical Damage Threshold
at 1064 nm, t ~ 10 nsec, MW/cm2 |
250 |
| Optical Homogeneity |
~ 10-5 |
| Absorption Loss at 1064 nm |
< 0.1%/cm |
| Birefringence Gradient |
< 5 x 10-5 |
Refractive Indices at 20°C
| Wavelength, mm |
no |
ne |
| 0.43584 |
2.39276 |
2.29278 |
| 0.54608 |
2.31657 |
2.22816 |
| 0.63282 |
2.28647 |
2.20240 |
| 1.1523 |
2.2273 |
2.1515 |
| 3.3913 |
2.1451 |
2.0822 |
Typical Product Specifications
Optical Grade
|
Component |
Standard Size |
Electro-Optic Q-Switch
|
6 x 6 x 25 mm
7 x 7 x 25 mm
9 x 9 x 25 mm |
Nonlinear OPO and SHG
|
from 2 x 2 x 5 mm
to 15 x 15 x 50 mm |
| Acousto-Optical |
up to 25 x 25 x 50 mm |
Optical Waveguide Substrates
|
from 10 x 10 x 1 mm
to 30 x 60 x 1 mm |
|
Fabrication Spec. |
Standard Value |
| Dimensional Tolerances |
+/- 0.1 mm |
| Orientation Tolerances |
10-15 arc minutes |
| Surface Quality |
Scratch/Dig: 10/5
Flatness: l/4 -
l/10
Parallelism < 10 arc sec. |
| Coating |
R< 0.2% - single wavelength
R< 0.6% - broadband |
Acoustical Grade
Piezoelectric Transducers
| Standard Orientation |
Y+36°-cut - Longitudinal Mode
41° rotated X-cut - Shear Mode |
| Orientation Tolerances |
10 arc minutes or better |
| Typical Size, mm |
from 10 x 10 to 40 x 60; 0.1-1.5 Thk |
| Surface Quality |
One side polished 20/10; 1l per 25 mm flat
Other side is inspection polished
Parallelism is within 1 arc minute |
SAW Wafers
| Standard Orientation |
Y+127°51'-cut within 10 arc min. |
| Typical Size, mm |
Dia up to 76.2 ± 0.25 x 0.2-1.0 Thk |
| Surface Quality |
20/10 front face, back face is fine ground |
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