LiNbO3 非線形 (NLO) 結晶
LiNbO3結晶は、光ファイバー通信、非線形光学、量子光学など幅広い応用分野で重要な役割を果たしています。この高性能な材料は、高い光学ダメージしきい値と優れた光学非線形特性を有し、効率的な周波数変換、位相変調、光スイッチングを実現します。
Structural and Physical Properties of LiNbO3
| Crystal Structure | Trigonal, Space group R3C, Point group 3m |
|---|---|
| Cell Parameters | a=5.148 Å, 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 | 420-5200 nm |
|---|---|
| Optical Homogeneity | ～5 × 10-5/cm |
| Refractive indices at 1064 nm |
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 × d36 (KDP) d31 = 11.6 × d36 (KDP) d22 = 5.6 × 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, 1064 nm) |
Thermal and Electrical Properties of LiNbO3
| Melting Point | 1250℃ | |
|---|---|---|
| Cruie Temperature | 1140℃ | |
| Thermal Conductivity | 38W/m/K@25℃ | |
| Thermal Expansion Coefficients (at 25℃) | // a, 2.0 × 10-6/K // c, 2.2 × 10-6/K |
|
| Resistivity | 2 × 10-6Ω·cm@200℃ | |
| Dielectric Constants |
εS11/ε0 = 43 εT11/ε0 = 78 |
εS11/ε0 = 28 εT33/ε0 = 32 |
| Piezoelectric Strain Constant | D22=2.04(×10-11C/N) D33 = 19.22(×10-11C/N) |
|
仕様
- Transmitting wavefront distortion: less than 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: 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.