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SF11 Windows
SF11 is dense flint glass with excellent chemical
and physical properties. It has a good transmission in visible and near
IR similar to BK7. But its higher index and dispersion makes it unique
in fabrication of lenses with minimized aberrations and prisms/windows with
large dispersions. Various high quality HR, AR, and partial reflective
coatings are available on SF11 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.
Please contact us for your
specific needs.
Basic Properties of SF11 Glass
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Transparency Range: 400 - 2500 nm |
Transmission Curve |
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Density: 4.74 g/cm3
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Therm-Optic Coefficients:
dn/dT= x 10-5 /oC
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Optical Homogeneity:
Δn < 10-4/cm
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Knoop Hardness: 450 |
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Thermal Expansion Coefficient: |
α= 6.1 x 10-6/K
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Sellmeier
Equations:
(λ
in μm):
n2=1+ 1.73848λ2/( λ2
- 0.01361 ) +
0.31117λ2/(λ2-0.06160)+
1.17491 λ2 /(λ2-121.92300)
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Wavelength(nm) |
Index of refraction |
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1550 |
1.7447 |
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1320 |
1.7486 |
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1064.2 |
1.7543 |
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800 |
1.7648 |
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532 |
1.7948 |
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 |
Scratch and Dig 20/10 |
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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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Transmission
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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