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Lithium niobate (LiNbO3) is a ferroelectric material suitable for a variety of applications. Its versatility is made possible by the excellent electro-optic, nonlinear, and piezoelectric properties of the intrinsic material. It is one of the most thoroughly characterized electro-optic materials, and crystal growing techniques consistently produce large crystals of high perfection.
Frequency doubling for wavelengths >1μm and optical parametric oscillators (OPOs) pumped at 1064 nm as well as quasi-phase-matched (QPM) devices;
Pockel cells, Q-switches, and phase modulators;
Waveguide substrates, surface acoustic wave (SAW) wafers.
| Crystal Structure | Trigonal, space group R3c |
| Cell Parameters | a=0.515,c=13.863,Z=6 |
| Melting Point | 1255 +/-5ºC |
| Curie Point | 1140 +/-5ºC |
| Mohs Hardness | 5 |
| Density | 4.64 g/cm 3 |
| Absorption Coefficient | ~ 0.1%/cm @ 1064 nm |
| Solubility | insoluble in H2O |
| Relative Dielectric Constant | εT11/ε0: 85 |
| εT33/ε0:29.5 | |
| Thermal Expansion | ||a, 2.0 x 10 -6/K @ 25ºC |
| Coefficients at 25ºC | ||c, 2.2 x 10 -6/K @ 25ºC |
| Thermal Conductivity | 38 W /m /K @ 25ºC |
| Transparency Range | 420 - 5200 nm |
| Refractive Indices | n e = 2.146, n o = 2.220 @ 1300 nm |
| n e = 2.156, n o = 2.322 @ 1064 nm | |
| n e = 2.203, n o = 2.286 @ 633 m | |
| Optical Homogeneity | ~ 5 x 10 -5 /cm |
| Sellmeier Equations ( l in mm) | n o 2 (l ) = 4.9048+0.11768/(l2- 0.04750) - 0.027169l2 |
| n e 2 ( l) = 4.5820+0.099169/( l2 - 0.04443) - 0.021950 l2 |
Specifications:
| Material | Laser grade LiNbO3 |
| Orientation | ±0.5o |
| Dimensional Tolerance | ±0.1mm |
| Surface quality | 20/10 Scratch/Dig per MIL-O-13830B |
| Flatness | λ/8 @ 633 nm |
| Perpendicularity | 5 arc min |
| Parallelism | better than 20 arc sec |
| Clear Aperture | > Central 90% |
| AR Coating | AR coating with R < 0.2% at center Wavelength |
4. Related LiNbO3 Optical Wafer we can supply
optical grade quality wafers
Saw grade quality wafers
MgO doped LiNbO3
Fe doped LiNbO3
Innovation point: Through the growth equipment modification,we create simulation of crystal growth system and can design crystal shape. The computer chip control the changing of crystal shape according to crystal growth status, through the processing of precision sensor signals. We self-design a set of graded composite temperature structure. With the help of it, the temperature gradient in crystals, melt and the solid liquid interface reach the good state for optical crystal growth.
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