LiNbO3


Extinction ratio                > 400:1 @ 633 nm, φ6 mm beam

Wavefront distortion         <λ/4 @ 633 nm

Flatness                          λ/8 at 633 nm

Finish                             10/5 scratch/dig

Parallelism                       < 20"

Melting Point                   1253ºC
Density                           4.64g/cm3




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. The following table list the specifications of a typical LiNbO3 crystal used as Q-switch with transverse E-O modulation. The light propagates in z-axis and electric field applies to x-axis. The electro-optic coefficients of LiNbO3 are: r33 = 32 pm/V, r31 = 10 pm/V, r22 = 6.8 pm/V at low frequency and r33 = 31 pm/V, r31= 8.6 pm/V, r22 = 3.4 pm/V at high electric frequency. The half–wave voltage: Vπ=λd/(2no3r22L), r c=(ne/no)3r33-r13.

Basic Properties

Crystal Structure

Single crystal,Synthetic

Density

4.64g/cm3

Melting Point

1253ºC

Transmission Range(50% of total transmission)

0.32-5.2um(thickness 6mm)

Molecular Weight

147.8456

Young’s Modulus

170GPa

Shear Modulus

68GPa

Bulk Modulus

112GPa

Dielectric Constant

82@298K

Cleavage Planes

No Cleavage

Poisson Ratio

0.25

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

Typical SAW Properties

 

Cut Type

SAW Velocity
Vs (m/s)

Electromechanical Coupling Factor
k2s (%)

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

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

127.86o Y-X

3970

5.5

-60

78

Y-X

3485

4.3

-85

95

 

 

 

 

 

Typical Specifications

 

Type Specifications

Boule

Wafer

Diameter

Φ3"

Φ4"

Φ3"

Φ4"

Length or Thickness(mm)

≤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 5-15 Å

Back Side Lapping

 

0.3-1.0 mm

Flatness (mm)

 

≤ 15

Bow (mm)

 

≤ 25


Technical Parameters

Size

9 X 9 X 25 mm3 or 4 X 4 X 15 mm3

Other size is available upon request

Tolerance of size

Z-axis: ± 0.2 mm

X-axis and Y-axis:±0.1 mm

Chamfer

less than 0.5 mm at 45°  

Accuracy of orientation

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

Parallelism

< 20"

Finish

10/5 scratch/dig

Flatness

λ/8 at 633 nm

AR-coating

R < 0.2% @ 1064 nm

Electrodes

Gold/Chrome plated on X-faces

Wavefront distortion

<λ/4 @ 633 nm

Extinction ratio

> 400:1 @ 633 nm, φ6 mm beam

Customized

You can customise this product to your needs. If you do not find suitable specifications for your application please contact us for custom solution.