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All Products / Optics / Windows and Diffusers / UV and IR Windows / Calcium Fluoride (CaF2) Windows
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TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More

50.8mm Diameter, VIS-NIR Coated, Calcium Fluoride Window

TECHSPEC Calcium Fluoride (CaF2) Windows

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Stock #14-822 3-4 days
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£102.85 £257.13
Qty 1-10
£102.85 £257.13
Qty 11+
£92.56 £231.41
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Abbe Number (vd):
94.99
Axis Orientation:
Random
Bevel:
Protective as needed
Clear Aperture (%):
90
Clear Aperture CA (mm):
45.72
Diameter (mm):
50.80 +0.0/-0.1
Thickness (mm):
3.00 ±0.1
Coating:
VIS-NIR (400-1000nm)
Coating Specification:
Rabs ≤0.25% @ 880nm
Ravg ≤1.25% @ 400 - 870nm
Ravg ≤1.25% @ 890 - 1000nm
Coefficient of Thermal Expansion CTE (10-6/°C):
18.85
Density (g/cm3):
3.18
Edges:
Fine Ground
Index of Refraction nd:
1.434
Knoop Hardness (kg/mm2):
158.3
Parallelism (arcmin):
<1
Poisson's Ratio:
0.26
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Calcium Fluoride (CaF2) Vacuum UV Grade
Surface Flatness (P-V):
λ/2
Surface Quality:
40-20
Type:
Protective Window
Wavelength Range (nm):
400 - 1000
Young's Modulus (GPa):
75.8
Damage Threshold, By Design: Damage threshold for optical components varies by substrate material and coating. Click here to learn more about this specification.
5 J/cm2 @ 532nm, 10ns

Regulatory Compliance

RoHS 2015:
Compliant
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Certificate of Conformance:
View
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Reach 235:
Compliant
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Product Family Description

TECHSPEC® Calcium Fluoride (CaF2) Windows offer a low index of refraction, providing high transmission from 200 - 7000nm when used uncoated. To further increase transmission and reduce back reflections, a variety of AR coatings are available spanning wavelength regions from the Ultra-Violet (UV) to the Mid-Wave Infrared (MWIR). The high bulk damage threshold of calcium fluoride coupled with its low absorption makes it a popular choice for use with laser systems, including excimer lasers. TECHSPEC® Calcium Fluoride (CaF2) Windows are ideal for use as protective windows for gas detectors operating in the Vacuum UV (VUV) and MWIR, UV spectroscopy systems, cryogenically cooled thermal imaging systems, and as substrates for coatings requiring wideband substrate transmission. 

Note: Calcium fluoride is a relatively soft optical material and is more susceptible to scratches than typical glass windows.