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CaF2 (Calcium Fluoride) Windows
CaF2
is a cubic crystal with an excellent transmission from 130 nm to 10 μm
and 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.
CaF2 used for
stable femtosecond white light generation from UV to IR
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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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800 |
1.4305 |
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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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