Material Fused Silica (KU1)
Ultraviolet Grade Synthetic Fused Silica (KU1)
Fused silica is the glassy form of quartz and is thus isotropic. It is tough and hard and has a very low expansion. Normal varieties contain water which gives strong absorption in the IR. Water-free varieties are available.
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PARAMETER |
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VALUE |
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| OPTICAL |
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Refractive Index |
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nF (486nm) = 1.4631; nd (588nm) = 1.4585; nC (656nm) = 1.4564 |
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Birefringence Constant |
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3.54 nm/cm3 |
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Refliction Loss |
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for two surfaces at 200nm - 9.1%; at 588nm - 6.8%; |
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Abbe Constant |
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67.8 |
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Bubbles/inclusions |
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None |
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| PHYSICAL |
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Density |
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2.201 g/cm2 |
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Softening Point |
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1600° C |
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Strain Point |
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1025° C |
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Annealing Point |
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1120° C |
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Max. Service Temperature |
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950° C (continuous)
1200° C (limited time) |
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Coefficient of Expansion |
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0.55 x 10-6/°C |
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Knoop Hardness |
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500 kg/mm2 |
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Young's Modulus |
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73 GPa at 25° C |
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Shear Modulus |
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31 GPa at 25° C |
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Bulk Modulus |
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36.9 GPa at 25° C |
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Poisson Ratio |
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0.17 at 25° C |
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Rupture Modulus |
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50 MPa at 25° C |
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Tensile Strength |
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50 MPa |
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Compressive Strength |
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1.1 GPa |
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Dielectric Strength |
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250-400 kV/cm at 20° C |
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| CHEMICAL |
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Molecular Weight |
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28.09 |
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Class/Structure |
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Amorphous glass |
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Chemical Stability |
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High resistance to water and acids (except hydrofluoric). |
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Impurity Content |
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Total metallic impurities: approximately 5 ppm |
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OH- Content |
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> 1000 ppm |
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Bubbles/inclusions |
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None |
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REFRACTIVE INDEX
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Wavelength, µm |
0.2 |
0.22 |
0.25 |
0.3 |
0.32 |
0.36 |
0.4 |
0.45 |
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Refractive Index |
1.551 |
1.528 |
1.507 |
1.488 |
1.483 |
1.475 |
1.470 |
1.466 |
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Wavelength, µm |
0.5 |
0.55 |
0.59 |
0.60 |
0.65 |
0.7 |
0.75 |
0.8 |
0.85 |
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Refractive Index |
1.462 |
1.460 |
1.458 |
1.458 |
1.457 |
1.455 |
1.454 |
1.453 |
1.452 |
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Wavelength, µm |
0.9 |
1.0 |
1.1 |
1.2 |
1.3 |
1.5 |
1.6 |
1.7 |
1.8 |
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Refractive Index |
1.452 |
1.450 |
1.450 |
1.448 |
1.447 |
1.445 |
1.443 |
1.442 |
1.441 |
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Wavelength, µm |
1.9 |
2.0 |
2.2 |
2.4 |
2.6 |
2.8 |
3.0 |
3.2 |
3.37 |
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Refractive Index |
1.440 |
1.438 |
1.435 |
1.431 |
1.428 |
1.424 |
1.419 |
1.414 |
1.410 |
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