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

LiNbO3
LiNbO3 is widely used as electro-optic modulators and Q-switches for Nd:YAG, Nd:YLF and Ti:Sapphire lasers as well as modulators for fiber optics. Hangzhou Lambda Photonics can provides the typical laser grade LiNbO3 crystal used as Q-switch with transverse E-O modulation.

LiNbO3 is also a good acousto-optic crystal and used for surface acoustic wave (SAW) wafer and A-O modulators. Hangzhou Lambda Photonics can also provides acoustic (SAW) grade LiNbO3 crystals in wafers, as-cut boules, finished components and custom fabricated elements.
1.Specifications of laser grade LiNbO3

 Size:

 upon the customer requirement

 Tolerance of size:

 Z-axis: ± 0.2 mm
X-axis and Y-axis:±0.1 mm

 Accuracy of orientation:

 Z-axis: <± 5'
X-axis and Y-axis: < ± 10'

 Chamfer:

 less than 0.5 mm at 45°

 Parallelism:

 < 20" Arc Seconds

 Finish:

 10/5 Scratch/Dig. (per MIL-O-13830A)

 Flatness:

 ≤Lambda/8 @632.8nm

 AR-coating:

 R < 0.2% @ 1064 nm
Other AR coating is available upon requirement

 Electrodes:

 Gold/Chrome plated on X-faces

 Wavefront distortion:

 <λ/4 @ 633 nm

 Extinction ratio:

 > 400:1 @ 633 nm, φ6 mm beam

 
2.Typical SAW Properties for Acoustic Grade LiNbO3

 Cut Type:

 127.86o Y-X

Y-X

 SAW Velocity Vs (m/s):

 3970

3485

 Electromechanical Coupling  Factor k2s (%):

 5.5

4.3

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

 -60

-85

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

 78

95

 
3.Specifications for Acoustic Grade boules and SAW Wafers

 Specifications \ Type

 Boule

 Wafer

 Typical Diameter (mm):

 Φ40± 2

 Φ50± 2

 Φ76.2± 2

Φ40.0, Φ50.8, Φ76.2, Φ101.6

 Length/Thickness (mm):

 ≤300

≤150
≤100

0.2～1.0

 Typical Orientation:

 X,Y,Z,127.86°Y , 64°Y, 135°Y

 Ref. Flat Orientation:

 X or Y

 Ref. Flat Width:

 16± 2 @Φ40.0,  18± 2@Φ50.8,  22± 2@ Φ76.2,  32± 2@Φ101.6

 Front Polish:

 0.016～0.001μm

 Back Lapping:

 0.3～10

 Flatness:

 ≤10μm

 Bow:

 ≤20μm for Φ40.0 and Φ50.8,    ≤40μm for Φ76.2,    ≤50μm for Φ101.6