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Fused Silica (SiO2) Windows
Fused silica is the amorphous form of
quartz. Advantages of fused silica
material include the extremely good transparency from UV to IR, low
coefficient of thermal expansion, large resistance to thermal shock over
large temperature excursions, wide thermal operating range and high
laser damage threshold. Various high quality HR, AR, and partial
reflective coatings are available on fused silica faces.
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Shapes and Geometries
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Round Parallel Windows
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Round Wedge Windows
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Square Parallel Windows
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Rectangular Parallel Windows
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* Other shapes and
geometries are routinely fabricated by Newlight Photonics In.. Please contact us for your
specific needs.
Basic Properties of Fused Silica Glass
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Transparency Range: 185 - 2300 nm |
Transmission Curve |
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Density: 2.2 g/cm3
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Thermo-Optic Coefficients:
dn/dT= 1.2 x 10-5 /oC
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Optical Homogeneity:
Δn < 10-6/cm
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Mohs Hardness: 7 |
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Thermal Conductivity: 1.38 W/m/K |
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Thermal Expansion Coefficient: |
α = 0.54 x 10-6/K
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Sellmeier equations:
(λ
in μm)
:
n2=1 + 0.69617λ2/(λ2
- 0.00468) + 0.40794λ2/(λ2 - 0.01351) +
0.89748 λ2/(λ2 - 97.93400)
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Wavelength(nm) |
Index of refraction |
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1550 |
1.4440 |
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1320 |
1.4466 |
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1064 |
1.4496 |
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532 |
1.4607 |
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355 |
1.4761 |
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266 |
1.4997 |
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213 |
1.5352 |
Specifications of Fused Silica Windows
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Dimension Tolerance: |
±0.1mm |
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Clear Aperture: |
> 85% |
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Surface Quality: |
20/10 Scratch and Dig
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Perpendicularity: |
<10 arc min |
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Parallelism (For Parallel Windows): |
<10" |
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Wedge Angle Tolerance (For Wedges): |
1' |
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Flatness:
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λ/8 @ 632.8 nm
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Wavefront Distortion: |
<λ/8 @ 632.8 nm
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Bevel: |
<0.25mm X 45° |
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Coatings: |
AR Coatings: R<0.3%
HR Coatings: R>99.6%
PR Coatings: R=3-95%
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