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LiNbO3
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Lithium Niobate(LiNbO3) Crystal is used as frequency doubler for wavelength > 1 mm and optical parametric oscillator (OPO) pumped at 1064 nm as well as quasi-phase-matched (QPM) devices, due to its large Electro-Optic (E-O) and Acousto-Optic (A-O) coefficients.
High quality and large size LiNbO3 crystal as frequency doublers, OPO and quasi-phase-matched doubler, as well as waveguide substrate and SAW wafers, with aperture of (1 - 15) x (1 - 15) mm2 and length up to 50 mm for frequency doubler and optical parametric oscillator (OPO), 50x50x1 mm3 or Dia. 3" x 0.35-1 mm LiNbO3 substrate for waveguide optics, and Dia. 3" or 4” SAW wafers are available with high volume and at low price from CORSTEC. |
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Physical properties
Structure |
Trigonal, Space group R3C, Point group 3m |
Cell Parameters |
a=5.148Å , c=13.863Å |
Melting Point |
1253ºC |
Curie Temperature |
1140ºC |
Mohs Hardness |
5 |
Density |
4.64 g/cm3 |
Deliquescence |
None |
Optical Homogeneity |
~ 5x10-5/cm |
Thermal Expansion coef.(@ 25°C) |
//a, 2.0x10-6/K ,//c, 16.7x10-6/K |
Thermal Conductivity Coefficient |
38 W/m/K at 250C |
Thermal Optical Coefficient |
dno/dT=-0.874x10-6/K at 1.4m m
dne/dT=39.073x10-6/K at 1.4m m |
Nonlinear Optical Properties
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 |
NLO Coefficients |
d33 = 34.4 pm/V,d31 = d15 = 5.95 pm/V, d22 = 3.07 pm/V |
Effective NLO coefficients |
deff =5.7 pm/V or ~14.6 x d36 (KDP) for frequency doubling 1300 nm;
deff =5.3 pm/V or ~13.6 x d36 (KDP) for OPO pumped at 1064 nm;
deff =17.6 pm/V or ~45 x d36 (KDP) for quasi-phase-matched structure. |
Electro-Optic Coefficients |
gT33 = 32 pm/V, gS33 = 31 pm/V,
gT31 =10 pm/V, gS31=8.6 pm/V,
gT22 = 6.8 pm/V, gS22= 3.4 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 (10 ns, 1064nm) |
Sellmeier equations
( l in m m) |
no2 = 4.9048 + 0.11768/(l 2-0.04750)-0.027169l 2
ne2 = 4.5820 + 0.099169/(l 2-0.04443)-0.021950l 2 |
MgO:LiNbO3 has similar effective nonlinear coefficients to pure LiNbO3. Its Sellmeier equations (for 7 mol% MgO dopant ) are:
no2 = 4.8762+ 0.11554/(l 2-0.04674)-0.033119l 2
ne2 = 4.5469+ 0.094779/(l 2-0.04439)-0.026721l 2
Specifications
Material: |
Laser grade LiNbO3 |
Orientation: |
±0.5 o |
Dimensional Tolerance: |
±0.1mm |
Surface quality: |
20/10 Scratch/Dig per MIL-O-13830B |
Flatness: |
l/8 at 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 |
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