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/m)

CE33 2.77(×1011N/m)

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/ε78  

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.

 
 
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