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KNbO3 |
Potassium niobate possesses the largest nonlinear coefficients for wavelength conversion of all commercially available inorganic materials. Strong, natural birefringence(ne-no=0.22),especially and high nonlinear coefficient make potassium niobate one of the most versatile materials for SHG, SFM and OPO nonlinear conversion.
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Physical Properties
Structure |
Orthorhombic,mm2 (at temperature from –50ºC to 222+/-4ºC) |
Lattice Parameters |
a = 5.68961A, b = 3.9692A, c = 5.7256A |
Density |
4.62g/cm3 |
Mohs Hardness |
5 |
Thermal Expansion |
aa=5.010x10-6/ºC
ab=1.410x10-5/ºC
ac=5.010x10-7/ºC |
Phase Transition Temperature |
-50ºC; 220ºC; 430ºC |
Optical Properties
Transparent Range |
400 - 4500 nm |
Absorption Loss |
<=1%/cm at 1064nm |
Damage Threshold |
>=4J/cm2 at 527nm (500ps)
>=6J/cm2 at 1054nm (700ps) |
Sellmeier equations: (λ in um) |
nx2 = 4.4208 + 0.10044/(λ2 - 0.054084) - 0.019592 λ2
ny2 = 4.8355 + 0.12839/(λ2 - 0.056342) - 0.025379 λ2
nz2 = 4.9873 + 0.15149/(λ2 - 0.064143) - 0.028775 λ2 |
CORSTEEC supplies a wide variety of finished KNbO3. Our standard product includes:
Aperture |
2 ~ 10mm |
Length |
0.3 ~ 20mm |
Configuration |
Flat, spherical, parallel and wedged. |
Coating |
Antireflective and reflective etc. upon request |
Typical Specifications
Lateral dimension tolerance |
+/-0.2mm |
Length tolerance |
+/-0.2mm |
Perpendicularity |
±0.5º |
Parallelism |
15 arc seconds |
Surface quality |
S/D better than 20/10 |
Surface flatness |
l/8 @ 632.8nm |
Clear aperture |
Central 80% |
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