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
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Crystal Structure:
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Trigonal, Space group R3C, Point group 3m
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Cell Parameters:
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a=5.148Å , c=13.863 Å
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Melting Point:
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1253°C
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Curie Temperature:
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1140°C
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Mohs Hardness:
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5
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Density:
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4.64 g/cm3
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Elastic Stiffness Coefficients
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CE11= 2.33(×1011N/m2 )
CE33= 2.77(×1011N/m2 )
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Optical and Electro-optical Properties of LiNbO3
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Transparency Range:
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420-5200nm
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Optical Homogeneity:
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~ 5 x 10-5 /cm
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Refractive indices at 1064nm:
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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
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NLO Coefficients:
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d33 = 86 x d36 (KDP)
d31 =11.6 x d36 (KDP)
d22 = 5.6 x d36 (KDP)
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Effective NLO Coefficients:
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deff(I)=d31sinθ-d22cossin3Φ
deff(II)=d22cos2θcos3Φ
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Electro-Optic Coefficients
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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,
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Half-Wave Voltage, DC
Electrical field // z, light ┴ z:
Electrical field // x or y, light // z:
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3.03 KV
4.02 KV
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Damage Threshold
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100 MW/cm2 (10 ns, 1064nm)
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Thermal and Electrical Properties of LiNbO3
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Melting Point:
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1250°C
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Cruie Temperature:
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1140°C
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Thermal Conductivity:
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38W/m/K@25°C
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Thermal Expansion Coefficients(at 25°C):
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// a, 2.0x10-6/K
// c, 2.2x10-6/K
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Resistivity:
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2x10-6Ω·cm@200°C
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Dielectric Constants:
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εS11/ε0 =43 εT11/ε0 =78
εS11/ε0 =28 εT33/ε0 =32
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Piezoelectric Strain Constant:
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D22=2.04(x10-11C/N)
D33=19.22(x10-11C/N)
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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-PRF-13830B
· 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.
