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CaF2 (Calcium Fluoride) Windows
CaF2
is a cubic crystal with a good transmission from 130 nm to 10 μm
and has a has widespread applications in the ultraviolet and infrared
spectra. CaF2
is slightly soluble in water and is susceptible to thermal shock,
therefore it has to be used in a dry environment and with a small
temperature change.
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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 CaF2 Crystals
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Transparency Range: 130 - 10000 nm |
Transmission Curve |
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Crystal Symmetry: Cubic |
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Density: 3.18 g/cm3
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Thermo-Optic Coefficients:
Δn/dT= -13.1 x 10-6 /oC
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Optical Homogeneity: Δn < 10-6/cm
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Mohs Hardness: 4 |
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Thermal Conductivity: 10 W/m/K |
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Thermal Expansion Coefficients: |
α = 18 x 10-6/K
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Sellmeier equations
(λ in
µm):
n2=1+
0.56759λ2/(λ2
- 0.00253 ) +
0.47109λ2/(λ2-0.01001)+
3.84847λ2/(λ2-1200.56000) |
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Wavelength(nm) |
Index of refraction |
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5000 |
1.3989 |
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2500 |
1.4211 |
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1064. |
1.4284 |
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532 |
1.4353 |
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355 |
1.4458 |
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266 |
1.4618 |
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213 |
1.4850 |
Specifications of CaF2 Windows
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Dimension tolerance |
±0.1mm |
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Clear Aperture |
> 85% |
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Surface Quality |
80/50 Scratch and Dig
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Perpendicularity |
<10 arc min |
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Parallelism |
<1' |
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Flatness
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λ/2 @ 632.8 nm |
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Transmission
Wavefront Distortion |
<λ/2 @632.8 nm |
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Bevel |
<0.25mm X 45° |
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coatings: |
N/A
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