Almaz Optics, Inc.
12 Chadsford Ct.  Marlton, NJ 08053, USA
Tel:  856 797-0491, Fax: 856 797-0228
e-mail: mail@almazoptics.com

 

































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. 


Main Properties

(Congruent Melt- 48.6 mol.% LiO2)

Chemical Formula

LiNbO3

Crystal Class

Trigonal, 3m

Lattice Constant,

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, x cm
angle, mrad x cm


0.6
2.3
47

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 20C

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