LiNbO3 非線形 (NLO) 結晶
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℃ |
| Curie Temperature: | 1140℃ |
| Mohs Hardness: | 5 |
| Density: | 4.64 g/cm3 |
| Elastic Stiffness Coefficients | CE11= 2.33(×1011N/m2 ) CE33= 2.77(×1011N/m2 ) |
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-d22cossin3⌀ deff(II)=d22cos2θcos3⌀ |
| Electro-Optic 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, |
| 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℃ |
|---|---|
| Cruie Temperature: | 1140℃ |
| Thermal Conductivity: | 38W/m/K@25℃ |
| Thermal Expansion Coefficients(at 25℃): | // a, 2.0x10-6/K // c, 2.2x10-6/K |
| Resistivity: | 2x10-6Ω·cm@200℃ |
| Dielectric Constants: | εS11/ε0 =43 εT11/ε0 =78 εS11/ε0 =28 εT33/ε0 =32 |
| Piezoelectric Strain Constant: | D22=2.04(x10-11C/N) D33=19.22(x10-11C/N) |
The Sellmeier equations(λ in µm):
仕様
- 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.
技術資料
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