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Birefringent Crystal
optical crystal
LiNbO3
LiNbO₃ crystals feature low cost, excellent mechanical and physical properties, and outstanding optical uniformity. Therefore, LiNbO₃ wedge plates are widely used in fiber optic isolators and circul..
Product description
LiNbO₃ crystals feature low cost, excellent mechanical and physical properties, and outstanding optical uniformity. Therefore, LiNbO₃ wedge plates are widely used in fiber optic isolators and circulators.
Basic Characteristics of LiNbO₃ Crystals
| Crystal Structure | Trigonal system, space group R3c, point group 3m |
| Melting Point | 1253°C |
| Mohs Hardness | 5 |
| Density | 4.64 g/cm³ |
| Deliquescence | None |
| Optical Uniformity | ～5×10⁻⁵/cm |
| Transmission Range | 420 nm - 5200 nm |
| Absorption Coefficient | ～0.1%/cm @ 1064 nm |
| Refractive Index 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 |
| Coefficient of Thermal Expansion (at 25°C) | //a, 2.0×10⁻⁶/K //c, 2.2×10⁻⁶/K |
| Thermal Conductivity | 38 W/m/K at 25°C |
| Thermo - optic Coefficient | dnₒ/dT = - 0.874×10⁻⁶/K at 1.4 μm dnₑ/dT = 39.073×10⁻⁶/K at 1.4 μm |
| Sellmeier Equation (λ in μm) | nₒ² = 4.9048 + 0.11768/(λ² - 0.04750) - 0.027169λ² nₑ² = 4.5820 + 0.099169/(λ² - 0.04443) - 0.02195λ² |
Specifications of LiNbO₃ Wedge Plates
| Aperture | 1.0×1.0 mm² to 4×4 mm² |
| Size Tolerance | ±0.05 mm |
| Wedge Angle Tolerance | ±0.1° |
| Optical Axis Orientation Accuracy | ±0.5° |
| Flatness | λ/4 @ 632.8 nm |
| Surface Finish | 20/10 |
| Anti - reflection Coating | R＜0.2% @ 1550 nm ± 40 nm |
| Standard Size | 1.25 mm×1.25 mm×0.5 mm with 13° or 15° wedge, φ = 22.5° |
Note: Other sizes and coating systems can be customized according to requirements.
