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LiNbO3
- LiNbO3 Crystal is widely used as frequency doublers for wavelength >1μm and optical parametric oscillators(OPOs) pumped at 1064 nm as well as quasi-phase-matched (QPM) devices. Additionally due to its large Electro-Optic(E-O) and Acousto-Optic(A-O) coefficients, LiNbO3 crystal is the most commonly used material for Pockel Cells, Q-switches and phase modulators, waveguide substrate, and surface acoustic wave(SAW) wafers, etc. CASTECH can provide LiNbO3 crystals with high quality and large size for all these applications.
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Structure and Physical Properties of LiNbO3
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Crystal Structure |
Trigonal, Space group R3c, Point group 3m |
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Cell parameters |
a=5.148 Å , c=13.863 Å |
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Melting Point |
1253℃ |
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Curie Temperature |
1140℃ |
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Mohs Hardness |
5 |
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Density |
4.64g/cm3 |
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Elastic Stiffness Coefficient |
CE11 =2.33(×1011N/m2 ) CE33 =2.77(×1011N/m2 ) |
Optical and Electro-optical Properties of LiNbO3
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Transparency Range |
420-5200nm |
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Optical Homogeneity |
～5×10-5/cm |
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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 |
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NLO Coefficients |
d33 = 86 x d36 (KDP) d31 =11.6 x d36 (KDP) d22 = 5.6 x d36 (KDP) |
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Electro-optical Coefficients |
γT33 = 32 pm/V, γS33 = 31 pm/V γT31 =10 pm/V, γS31=8.6 pm/V γT22 = 6.8 pm/V, γS22= 3.4 pm/V |
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Half-Wave Voltage，DC Electrical field∥z，light⊥z： Electrical field∥x or y，light∥z： |
3.03 KV 4.02 KV |
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Damage Threshold |
100 MW/cm2 (10 ns, 1064nm) |
Thermal and Electrical Properties of LiNbO3
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Melting Point |
1250 ℃ |
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Curie Temperature |
1140 ℃ |
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Thermal Conductivity Coefficient |
38W/m/K @25 ℃ |
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Thermal Expansion Coefficients（at 25℃） |
//a, 2.0×10-6/K //c, 2.2×10-6/K |
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Resistivity |
2×10-6 Ω·cm @200 ℃ |
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Dielectric Constant |
εS11/ε0 =43 εT11/ε0=78 εS33/ε0 =28 εT33/ε0= 32 |
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Piezoelectric Strain Constant |
D22=2.04(×10-11C/N ) D33=19.22 (×10-11 C/N ) |
The Sellmeier Equations (λ in μm):
no2=4.9048+0.11768/（λ2-0.04750）-0.027169λ2
ne2=4.5820+0.099169/（λ2-0.04443）-0.02195λ2
Specification
- Transmitting wavefront distortion: ＜ λ/4 @633 nm
- Dimension tolerance: (W ± 0.1 mm) × (H ± 0.1 mm) × (L ± 0.2mm)
- Clear aperture:> 90% central area
- Flatness: λ/8 @633 nm
- Scratch/Dig code: 20/10 to MIL-PRF-13830B
- Parallelism: ＜ 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 532nm per surface.
*Other coatings are available upon request.
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