| Lithium Niobate
Crystal (LiNbO3) |
| |
LiNbO3 Crystal is widely used
as frequency doublers for wavelength > 1μm and optical parametric
oscillators (OPOs) pumped at 1064 nm and quasi-phase-matched
(QPM) devices. Additionally due to its large Electro-Optic(E-O)
and Acousto-Optic(A-O) coefficients,, LiNbO3 is the most commonly used
material for Pockel Cells,Q-switches and phase nodulators,waveguide
substrate,and surface acoustic wave (SAW) wafers,etc.CASTECH
can provide high quality and large size LiNbO3 crystals for all of these
applications. |
|
|
| Structural
and Physical Properties of LiNbO3:
| Crystal
Structure: |
Trigonal,
Space group R3C, Point group 3m |
| Cell
Parameters: |
a=5.148Å
, c=13.863 Å |
| Melting
Point: |
1253°C |
| Curie
Temperature: |
1140°C |
| Mohs
Hardness: |
5 |
| Density: |
4.64
g/cm3 |
| Elastic
Stiffness Coefficients |
CE11
2.33(×1011N/m2 )
CE33 2.77(×1011N/m2 ) |
Optical
and Electro-optical Properties of LiNbO3
:
| Transparency
Range: |
420-5200nm |
| Optical
Homogeneity: |
~
5 x 10-5 /cm |
| Refractive
indices at 1064nm: |
ne
= 2.146, no = 2.220 @ 1300 nm
ne = 2.156, no
= 2.232 @ 1064 nm
ne = 2.203, no
= 2.286 @ 632.8 nm |
| NLO
Coefficients: |
d33
= 86 x d36 (KDP)
d31 =11.6 x d36
(KDP)
d22 = 5.6 x d36
(KDP) |
| Effective
NLO Coefficients: |
deff(I)=d31sinθ-d22cossin3φ
deff(II)=d22cos2θcos3φ |
| Electro-Optic
Coefficients |
r
T33 = 32 pm/V, rS33 = 31 pm/V,
rT31 =10 pm/V, rS31=8.6 pm/V,
rT22 = 6.8 pm/V, rS22= 3.4 pm/V, |
| Half-Wave
Voltage, DC
Electrical field // z, light
┴ z:
Electrical field // x or
y, light // z: |
3.03
KV
4.02 KV |
| Damage
Threshold |
100
MW/cm2 (10 ns, 1064nm) |
Thermal and Electrical Properties
of LiNbO3:
| Melting
Point: |
1250°C |
| Cruie
Temperature: |
1140°C |
| Thermal
Conductivity: |
38W/m/K@25°C |
| Thermal
Expansion Coefficients(at 25°C): |
//
a, 2.0x10-6/K
// c, 2.2x10-6/K |
| Resistivity: |
2x10-6Ω·cm@200°C |
| Dielectric
Constants: |
εS11/ε0 43
εT11/ε0 78
εS11/ε0 28
εT33/ε0 32 |
| Piezoelectric
Strain Constant: |
d222.04(x10-11C/N)
d3319.22(x10-11C/N) |
The Sellmeier equations(λ in μm):
Specifications:
· Transmitting
wavefront distortion: less than λ/4 @ 633 nm
· Dimension tolerance: (W ± 0.1 mm) x (H ± 0.1 mm) x
(L ± 0.2mm)
· Clear aperture: > 90% central area
· Flatness: λ/8 @ 633 nm
· Scratch/Dig code: 20/10 to MIL-O-13830A
· Parallelism: better than 20 arc seconds
· Perpendicularity: 5 arc minutes
· Angle tolerance: < ± 0.5°
· AR coating: dual wave band AR coating at 1064/532 nm
on both surfaces, with R < 0.2% at 1064 nm and R < 0.5%
at 532 nm per surface. Other coatings are available upon request. |
