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LN Crystal
• Various sizes of finished components for different applications.
• Strict quality control
• Very competitive price and reliable delivery
• Technical support at any time
LN Crystal is a multifunctional material that integrates properties of piezoelectric, ferroelectric, pyroelectric, nonlinear, electro-optical, photoelastic, etc. LiNbO3 has good thermal stability and chemical stability.
As one of the most thoroughly characterized nonlinear optical materials, LiNbO3 is suitable for a variety of frequency conversion applications. For example, it is widely used as frequency doublers for wavelength >1 μm and optical parametric oscillators (OPOs) pumped at 1064 nm as well as quasi-phase-matched (QPM) devices. Due to its large E-O and A-O coefficients, LiNbO3 crystal is also commonly used for phase modulators, waveguide substrate, surface acoustic wave wafers, and Q-switching of Nd:YAG, Nd:YLF and Ti-Sapphire lasers.
LiNbO3 can be doped with a variety of elements, such as Er, Pr, Mg, Fe, etc., which give the material unique properties. For example, the damage threshold of MgO: LiNbO3 is more than double that of pure LiNbO3.
WISOPTIC Standard Specifications* -LN Crystal
Dimension Tolerance | ± 0.1 mm |
Angle Tolerance | ± 0.5° |
Flatness | < λ/8 @ 632.8 nm |
Surface Quality | < 20/10 [S/D] |
Parallelism | < 20” |
Perpendicularity | ≤ 5' |
Chamfer | ≤ 0.2mm @ 45° |
Transmitted Wavefront Distortion | < λ/4 @ 632.8 nm |
Clear Aperture | > 90% central area |
Coating | AR coating: R < 0.2% @ 1064 nm, R < 0.5% @ 532 nm |
* Products with special requirement upon request. | |
Advantages of MgO:LiNbO3 compared with LN Crystal
• Higher frequency doubling (SHG) efficiency for pulsed Nd:YAG (65%) and CW Nd:YAG (45%)
• Higher performance in applications of OPO, OPA, QPM doublers and integrated waveguide
• Much higher photorefractive damage threshold
Primary Applications - LN Crystal
• Frequency doublers for wavelength >1 μm
• Optical parametric oscillators (OPO) pumped at 1064 nm
• Quasi-phase-matched (QPM) devices
• Q-switches (for Nd:YAG, Nd:YLF and Ti-Sapphire lasers )
• Phase modulators, waveguide substrate, surface acoustic wave wafers
Physical Properties - LN Crystal
Chemical formula | LN Crystal |
Crystal structure | Trigonal |
Point group | 3m |
Space group | R3c |
Lattice constants | a=5.148 Å, c=13.863 Å, Z = 6 |
Density | 4.628 g/cm3 |
Melting point | 1255 °C |
Curie temperature | 1140 °C |
Mohs hardness | 5 |
Thermal conductivity | 38 W/(m·K) @ 25°C |
Thermal expansion coefficients | 2.0×10-6/K (//a), 2.2×10-6/K (//c) |
Hygroscopicity | Non-hygroscopic |
Optical Properties - LN Crystal
Transparency region | 400-5500 nm | ||||
Refractive indices | 1300 nm | 1064 nm | 632.8 nm | ||
ne=2.146 no=2.220 | ne=2.156 no=2.232 | ne=2.203 no=2.286 | |||
Thermal optic coefficients | dno/dT=-0.874×10-6/K @ 1.4 μm | ||||
Linear absorption coefficients | 326 nm | 1064 nm | |||
α = 2.0 /cm | α = 0.001~0.004 /cm | ||||
NLO coefficients | d33 = 34.4 pm/V, d22 = 3.07 pm/V, | ||||
Electro-optic coefficients | γT33=32 pm/V, γS33=31 pm/V, γT31=10 pm/V, | ||||
Half-wave voltage (DC) | Electrical field // z, light ⊥ z | 3.03 kV | |||
Electrical field // x or y, light // z | 4.02 kV | ||||
Damage threshold | 100 MW/cm2 @ 1064nm, 10 ns | ||||
