|
LiTaO3 is
an E-O crystal widely used for E-O devices, due
to its good optical, NLO and E-O properties, and
higher damage threshold. CASTECH supplies high quality
LiTaO3 boules and wafers with the following
specifications for standard applications. We can
also offer other specifications upon request:
Basic Properties of LiTaO3
| Crystal Structure: |
Trigonal, space group R3c,Point
group 3m |
| Cell Parameters: |
a=5.154Å,c=13.781Å |
| Melting point |
1650℃ |
| Curie Temperature: |
607℃ |
| Mohs hardness: |
5.5 |
| Density: |
7.46 g/cm3 |
| Dielectric Constant: |
ξ11/ξ0 51.7
ξ33/ξ0 44.5 |
| Elastic Stiffness
Coefficient: |
CE11 2.33(X
1011 N/m2)
CE33 2.77(X 1011
N/m2) |
| Piezoelectric
Strain Constant: |
d22
2.4(X 10-11 C/N)
d33 0.8(X 10-11 C/N) |
| Transmission range: |
400-4500nm |
| Electro-optical coefficients: |
r33 30.4pm/V |
| Refractive index at 632.8nm: |
no=2.176,ne=2.180 |
Typical SAW Properties:
| Cut Type |
νs(m/s) |
κ2s(%) |
TCV(10-6/oC) |
TCD(10-6/oC) |
| X-112oY |
3295 |
0.75 |
-16.50 |
22.3 |
| Y-Z |
3230 |
0.66 |
|
35 |
Typical Specifications:
| Type
Specifications |
Boule |
Wafer |
| Diameter |
Φ3" |
Φ4" |
Φ3" |
Φ4" |
| Length or Thickness |
≤100 |
≤50 |
≤0.35-0.5 |
| Orientation |
127.86°Y, 64°Y,
135°Y,X,Y,Z, and other cut |
| Ref.Flat Orientation |
X,Y |
| Ref.Flat Length |
22±2mm |
32±2mm |
22±2mm |
32±2mm |
| Front Side Polishing |
|
Mirror polished
5-15Â |
| Back Side Lapping |
|
0.3-1.0μm |
| Flatness(μm) |
|
≤15 |
| Bow(μm) |
|
≤25 |
|
