Products / A/O-E/O-Piezoelectrical Crystal

LiTaO3
LiTaO3 crystal is also widely used E-O crystal, due to its optical, NLO and E-O poperties similar to those of LiNbO3 crystal, but with higher damage threshold (> 500 MW/cm2 for ns pulsed).Hangzhou Lambda Photonics supplies high quality LiTaO3 boules, wafers or slices with the following specifications for standard applications. We can also offer other specifications upon request.

1. Specifications of boule and wafer

 Specifications \ Type

 Boule

 Wafer

 Typical Diameter (mm):

 Φ40± 2

 Φ50± 2

 Φ76.2± 2

Φ42.0± 0.5, Φ50± 0.5, Φ76.2± 0.5

 Length/Thickness (mm):

 ≤100

≤80
≤80

0.2～0.5

 Typical Orientation:

 36°Y , X, Z

 Ref. Flat Orientation:

 X

 Ref. Flat Width:

 22± 2mm

 Front Polish:

 0.25～0.016μm

 Back Lapping:

 7～15μm

 Flatness:

 ≤15μm

 Bow:

 ≤15μm for 42.0,    ≤20μm for Φ50.0,    ≤25μm for Φ76.2

 
2. Typical SAW Properties 

 Cut Type:

 X-112°Y

Y-Z

 SAW Velocity Vs (m/s):

 3295

3230

 Electromechanical Coupling  Factor k2s (%):

 0.75

0.66

 Temperature Coefficient of Velocity TCV (10-6/oC):

 -16.5

 Temperature Coefficient of Delay TCD (10-6/oC):

 22.3

35

 
3.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)

 Electro-optical coefficients:

 r33 30.4pm/V
 Refractive index at 632.8nm:
 no=2.176,ne=2.180