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Birefringent Crystal
![[ Castech ]<Br>LiNbO3<br>Birefringent Crystal](/thum_img/mjct/goods_img3/828088c1bda829a712e589d68e2e5f7c_water_4de0b559c44a49f5f544fca08f3bc282_c0_w300_h300.jpg)
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CASTECH provides：
• 50,000 to 100,000 pcs/month of LiNbO3 wedges used for fiber optical isolators and circulators;
• Reliable Delivery;
• Strict quality control;
• Technical support;
• Very competitive price.
Table 1. Basic Properties of LiNbO3
| Crystal Structure | Trigonal, Space group R3c, Point group 3m |
| Melting Point | 1253℃ |
| Mohs Hardness | 5 |
| Density | 4.64g/cm3 |
| Deliquescence | None |
| Optical Homogeneity | ～5×10-5/cm |
| Transparency Range | 420nm-5200nm |
| Absorption Coefficient | ～0.1%/cm @ 1064nm |
| 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 |
| Thermal Expansion Coefficients（at 25℃） | //a, 2.0×10-6/K //c, 2.2×10-6/K |
| Thermal Conductivity Coefficient | 38 W/m/K at 25℃ |
| Thermal Optical Coefficient | dno/dT=-0.874×10-6/K at 1.4 μm dne/dT=39.073×10-6/K at 1.4 μm |
| 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 |
Table 2. Specifications of LiNbO3
| Aperture | 1.0×1.0 mm2 to 4×4 mm2 |
| Dimension tolerance | ±0.05mm |
| Wedge Angle tolerance | ±0.1° |
| Optical axis orientation | ±0.5° |
| Flatness | λ/4 @ 632.8nm |
| Surface Quality | 20/10 |
| AR-coating | R＜0.2% @ 1550nm±40nm |
| Standard Size | 1.25mm×1.25mm×0.5mm with 13° or 15° wedge，phi=22.5° |
Note: Other sizes and coatings are available upon request.
