LiNbO₃ (Lithium Niobate) Crystal
Keywords:
Laser Crystals
Magneto-Optic Crystals
Scintillation Crystals
- Product Introduction
- Key advantages
- Application areas
- Product Features
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- Commodity name: LiNbO₃ (Lithium Niobate) Crystal
LiNbO₃ (Lithium Niobate) crystal's most remarkable characteristic lies in its inherent birefringence, which arises from its non-centrosymmetric crystal structure.
Product Introduction
LiNbO₃ (Lithium Niobate) crystal's most remarkable characteristic lies in its inherent birefringence, which arises from its non-centrosymmetric crystal structure. This property allows incident light to be split into two orthogonal polarization states, enabling a wide range of optical functionalities. Additionally, LiNbO₃ crystals are known for their robustness, low light absorption, cost-effectiveness, and superior mechanical and physical properties, along with excellent optical uniformity. As a result, LiNbO₃ wedge-shaped plates are widely used in fiber optic isolators and circulators, making them an attractive choice for fabricating polarization-based optical devices.
Key Advantages
- Wide transmission wavelength range, 350~5200 nm
- High damage threshold, high mechanical strength
- Perfectly suited for manufacturing Isolators, circulators, beam displacers, and polarization optical components, among others.Application Areas
- High-speed optical modulators and optical wwitches with high extinction ratios
- Fiber optic isolators and circulators
- Polarization optical devicesProduct Features
Material Properties
Crystal Structure
Trigonal, Space Group R3c, Point Group 3m
Lattice Constant
a=5.148 Å,c=13.863 Å
Density
4.64 g/cm³
Mohs Hardness
5 Mohs
Transparency Range
420–5200 nm
Electro-Optic Coefficient
γT₃₃=32pm/V, γS₃₃=31pm/V, γT₃₁=10 pm/V, γ S₃₁=8.6pm/V,
γT₂₂=6.8pm/V, γS₂₂=3.4pm/V,
Thermal Conductivity (@ 25 ℃)
38 W/m/K
Absorption Coefficient
0.1%/cm@1064 nm
Piezoelectric Constants
D₂₂=2.04×10⁻¹¹ C/N; D₃₃ =19.22×10⁻¹¹ C/N
Coefficient of Thermal Expansion (@ 25°C)
//a, 2.0×10⁻⁶ /K, //c, 2.2×10⁻⁶ /K
Refractive Index
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
Curie Temperature
1140°C
Melting Point
1253°C
Product Processing Indicators
Effective Aperture
>90%
Dimensional Tolerance
±0.05 mm
Chamfer
≤0.2×45°
Surface Quality
20-10 S-D
Flatness
≤λ/4@632.8 nm
Wedge Angle Tolerance
±0.1°
Chipped Edge
<0.1 mm
Coating
R<0.2%@1550 nm±40 nm
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- Excellent optical properties
- High mechanical strength and chemical stability
- Highly efficient laser performance
- Good thermal stability -
- Laser technology, optical polarization devices,
- Application areas such as optical window materials, optical component manufacturing, and scientific research
- Nonlinear optical devices
- Birefringent Wedge for Fiber Optic Isolators
- Fiber optic circulators and optical beam splitters. -
Material Properties Lattice structure Tetragonal crystal system, space group D4h Unit cell parameters a = b = 7.12 Å; c = 6.29 Å Density 4.22g/cm3 Mohs Hardness 5Mohs Transmission range 400–5000 nm Thermal-optic coefficient DNA/dT = 8.5 × 10⁻⁶ /K; dNc/dT = 3.0 × 10⁻⁶ /K Thermal conductivity //C: 5.23 W/m/K; ⊥C: 5.10 W/m/K Deliquescence Not prone to deliquescence Birefringence (ne-no) 0.2039 @ 1550 nm Coefficient of thermal expansion αa = 4.43 × 10⁻⁶ /K; αc = 11.37 × 10⁻⁶ /K
Refractive index ne = 2.1486 @ 1550 nm, no = 1.9447 @ 1550 nm Melting point 1825°C Product Processing Metrics Effective Aperture >90% Dimensional Tolerance ±0.05 mm Optical axis alignment accuracy ±0.5° Wedge Angle Tolerance ±0.1° Protective Chamfer ≤0.2 × 45° Surface finish 20-10 S-D Flatness ≤λ/4 @ 632.8 nm Chipped edge <0.1 mm Coating R < 0.2% @ 1550 or 1310 nm
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