CaF2(Calcium Fluoride)
CaF2 is a cubic crystal with an excellent transmission from 130 nm to 10 m and has widespread applications as transparent windows in the ultraviolet and infrared spectra. Recently, CaF2 windows found ..
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CaF2(Calcium Fluoride)
CaF2 is a cubic crystal with an excellent transmission from 130 nm to 10 μm and has widespread applications as transparent windows in the ultraviolet and infrared spectra. Recently, CaF2 windows found a wide use for broadband continuum generation (white light generation) pumped by femtosecond lasers. UPT supplies [001] cut (i.e. the surface is perpendicular to the [001] axis) high quality CaF2 windows for continuum generation. CaF2 windows cut along a random orientation and polycrystalline CaF2 are also available.
Basic Properties
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Transparency Range
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130 - 9000 nm
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Crystal Symmetry
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Cubic
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Density
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3.18 g/cm3
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Thermo-Optic Coefficients:
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dn/dT= -13.1 x 10-6 /oC
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Optical Homogeneity
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Δn < 10-6/cm
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Mohs Hardness
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4
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Thermal Conductivity
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10 W/m/K
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Thermal Expansion Coefficients:
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α= 18 x 10-6/K
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Sellmeier Equations (λ in µm):
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n2= 1+ 0.56759λ2/(λ2 - 0.00253 ) + 0.47109λ2/(λ2-0.01001) + 3.84847λ2/(λ2-1200.56000)
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Specifications
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Orientation:
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[001] (-C), random (-R) or as specified
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Dimension Tolerance:
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±0.1mm
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Clear Aperture:
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> 85%
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Parallelism:
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< 10 arc sec (T>=2mm)
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< 60 arc sec (T=<1mm)
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Flatness:
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λ/6 @ 632.8nm
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Surface Quality:
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20/10 Scratch and Dig
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Transmission Wavefront Distortion:
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< λ/6 @632.8nm
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Bevel:
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< 0.25mm X 45°
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Coatings:
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upon request
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Note: UPT can also produce a wide variety of custom products (round/square lens or windows etc.) upon request.