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CaF2 Windows


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CaF2 Windows

SpecificationWG50530WG51050
Thickness3 mm5 mm
Thickness Tolerance±0.3 mm
Diameter Tolerance+0.0 / -0.2 mm
Surface Quality20-10 Scratch-Dig
Parallelism≤10 arcsec
Surface Flatness (@633 nm)λ/8 over Clear Aperture
Clear Aperture>90% Diameter
Uncoated Transmission
(Raw Data)		Uncoated Transmission
Precision Window Selection Guide
Substrate MaterialWavelength Range
Magnesium Flouride (MgF2)120 nm - 6 μm
Sapphire150 nm - 5 μm
Calcium Fluoride (CaF2)180 nm - 8 μm
UV Fused Silica185 nm - 2.1 μm
Barium Flouride (BaF2)200 nm - 11 μm
N-BK7350 nm - 2.0 μm
Silicon (Si)1.2 - 8 μm
Zinc Selenide (ZnSe)600 nm - 16 µm
Germanium (Ge)2 - 16 μm

Features

  • Ø1/2" and Ø1" Versions Available
  • CaF2 Substrate
  • Wavelength Range: 180 nm - 8 μm

These Calcium Fluoride (CaF2) High Precision Windows, which are available in Ø1/2" and Ø1" sizes, offer high transmission from the vacuum ultraviolet (180 nm) to the infrared (8 μm). Given its low absorption coefficient and high damage threshold, the calcium fluoride crystal is a popular choice for use with excimer lasers. CaF2 windows are also commonly used in cryogenically cooled thermal imaging systems.

CaF2 has many desirable physical and chemical properties. With an Abbe Number of 95, calcium fluoride offers low dispersion. It also has excellent water, chemical, and heat resistance. In dry environments, CaF2 can be used up to 1000 oC, but in the presence of moisture, degradation will occur for temperatures exceeding 600 oC. This crystal is also inert to organic chemicals and many acids.

Thorlabs offers High Precision Windows fabricated from various substrate materials for use in a large variety of laser and industrial applications. We also offer laser windows, which have wavelength-specific AR coatings centered around commonly used laser wavelengths, and Brewster windows, which are known to eliminate p-polarization reflectance.

Optic Cleaning Tutorial
Optical Coatings and Substrates
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Posted Comments:
Poster: jlow
Posted Date: 2012-12-20 10:08:00.0
Response from Jeremy at Thorlabs: Ø40mm CaF2 window is not something that we have stock. However, we should be able to make this as a custom for you. We will contact you directly with regard to this custom window.
Poster: alexander.goldgirsh
Posted Date: 2012-12-10 14:34:07.323
Do you have CaF2 windowth 5 -6 mm thick with D=40 mm. What is price?
Poster: tcohen
Posted Date: 2012-04-10 10:55:00.0
Response from Tim at Thorlabs: Thank you for your feedback. This is manufactured with 20-10 Scratch-Dig and Surface Flatness (@633 nm) of ?/8 over the Clear Aperture. Because CaF2 is relatively soft and has a high thermal expansion coefficient, it is likely to have a worse surface roughness than some of our other standard glasses(such as N-BK7 or UVFS). Unfortunately, we are unable to provide rms surface roughness data for these windows. We would like to discuss your end goal so that we may provide information that you may have been looking to derive from the surface roughness, however, we do not have your contact information. If you would like to discuss this further, please email us at techsupport@thorlabs.com where an Applications Engineer would be happy to provide more information on these windows.
Poster:
Posted Date: 2012-04-05 17:02:05.0
What is the (approx) rms surface roughness of the CaF2 windows?
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Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
WG50530 Support Documentation WG50530 Ø1/2" (Ø12.7 mm) CaF2 Broadband Precision Window, Uncoated $71.60
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WG51050 Support Documentation WG51050 Ø1" (Ø25.4 mm) CaF2 Broadband Precision Window, Uncoated $89.60
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Additional Windows
  • N-BK7 Windows, 0.35 - 2 µm

  • UV Fused Silica Windows,
    0.185 - 2.1 µm

  • V-Coated Laser Windows

  • Wedged V-Coated Laser Windows

  • UV Fused Silica
    Brewster Windows

  • Sapphire Windows, 0.15 - 5 µm

  • Magnesium Fluoride Windows, 0.12 - 6 µm

  • Silicon Windows, 1.2 - 8 µm

  • Calcium Fluoride Windows,
    0.18 - 8 µm

  • Barium Fluoride Windows,
    0.2 - 11 µm

  • Zinc Selenide Windows,
    0.6 - 16 µm

  • Germanium Windows, 2 - 16 µm

  • Conductive Windows

  • High Vacuum Conflats and Windows

  • IR Windows

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