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Calcium Fluoride Windows


  • Uncoated Windows for 180 nm to 8 µm
  • AR-Coated Windows for 1.65 µm to 3 µm
  • Ø1/2" and Ø1" Sizes Available
  • Uncoated Windows Suitable for Excimer Laser Applications

WG51050

Ø1" Uncoated

WG50530

Ø1/2" Uncoated

WG51050-D

Ø1" D-Coated
1.65 - 3.0 µm

Related Items


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Precision Window Selection Guide
Wavelength Range Substrate Material
150 nm - 5.0 μm Sapphire
180 nm - 8.0 μm Calcium Fluoride (CaF2)
185 nm - 2.1 μm UV Fused Silica
200 nm - 6.0 μm Magnesium Fluoride (MgF2)
250 nm - 1.6 µm UV Fused Silica, for 45° AOI
300 nm - 3 µm Infrasil®
350 nm - 2.0 μm N-BK7
600 nm - 16 µm Zinc Selenide (ZnSe)
1.2 - 8.0 μm Silicon (Si)
2.0 - 16 μm Germanium (Ge)
3 - 5 μm Barium Fluoride (BaF2)
V-Coated Laser Windows
Zemax Files
Click on the red Document icon next to the item numbers below to access the Zemax file download. Our entire Zemax Catalog is also available.
Optic Cleaning Tutorial  Optical Coatings Guide

Features

  • Ø1/2" and Ø1" Versions Available
  • Uncoated CaF2 Wavelength Range: UV to IR (180 nm - 8 μm)
  • Available AR Coated for 1.65 - 3.0 µm (Ravg < 1.0%)

Thorlabs offers calcium fluoride (CaF2) High-Precision Windows either uncoated or with a broadband anti-reflective coating. The uncoated windows provide high transmission from the ultraviolet (180 nm) to the infrared (8 μm). The AR-coated windows feature an antireflection coating on both sides that provides increased transmission within the 1.65 - 3.0 µm specified wavelength range. Given its low absorption coefficient and high damage threshold, uncoated calcium fluoride crystal is a popular choice for use with excimer lasers. CaF2 windows are also commonly used in cryogenically cooled thermal imaging systems.

Calcium fluoride has a low absorption coefficient and high damage threshold, making these windows a good choice for use with free-space lasers. Optical calcium fluoride offers low dispersion (with an Abbe Number of 95) and low fluorescence, as well as excellent water, chemical, and heat resistance. In dry environments, CaF2 can be used up to 1000 °C, but in the presence of moisture, degradation will occur for temperatures exceeding 600 °C. Each window has a randomly oriented crystal axis.

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

Transmission of Uncoated CaF2
Click to Enlarge

Click for Raw Data
This graph shows the measured transmission of an uncoated calcium fluoride window at normal incidence.

AR-Coated Calcium Fluoride Transmission
Click to Enlarge

Click for Raw Data
This graph shows the measured transmission of an AR-coated calcium fluoride window at normal incidence. The shaded region denotes the AR coating range, over which Ravg < 1%. Performance outside of the specified range is not guaranteed and varies from lot to lot.
AR-Coated Sapphire Reflectance
Click to Enlarge

Click for Raw Data
This plot gives the measured reflectance (per surface) at normal incidence of our AR-coated calcium fluoride window. The average reflectance is <1.0% per surface within the shaded wavelength range of 1.65 µm - 3.0 µm.

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Posted Comments:
Poster:anatoliy
Posted Date:2017-05-18 20:01:29.27
Good time of day, What is the crystal orientation of your CaF2 windows? I look for {100} CaF2 windows or prisms of any shape. Best regards, Anatoliy.
Poster:nbayconich
Posted Date:2017-05-22 05:35:41.0
Thank you for contacting Thorlabs. Our Calcium Fluoride windows have a random crystal orientation. A Techsupport representative will reach out to you directly.
Poster:denis.balic
Posted Date:2016-11-15 11:52:14.84
Hello, Do you have an uncoated CaF2 disc that's 1" OD x 1/16" thick? Thanks
Poster:tfrisch
Posted Date:2016-11-17 07:20:00.0
Hello, thank you for contacting Thorlabs. I'll reach out to you directly about the other specs you would need for this custom.
Poster:calvin.brett
Posted Date:2016-07-11 12:44:37.663
Hello, we are looking for 1.5" CaF2 uncoated windows, thickness 4mm. We need up to 5 windows. Please let me know if this is possible.
Poster:dgu
Posted Date:2015-06-08 16:49:14.457
CaF2 windows: Standard Specifications Material CaF2: IR grade (intrinsic absorption <0.5% between 3-5 microns) Dimensions 18 mm x 22 mm ± 0.3mm Thickness 1.0 mm ± 0.2 mm Surfaces 60/40 Edges Fine Ground Flatness ≤5 Fringes One surface is AR-coated for MWIR region (3-5 microns), the other surface is blank Please provide cost info for 10 windows
Poster:besembeson
Posted Date:2015-09-03 12:25:15.0
Response from Bweh at Thorlabs USA: We will be contacting you by email for a quotation.
Poster:
Posted Date:2015-05-26 03:52:57.78
Hello, I am looking for a CaF2 crystal for white light continuum generation. Can you recommend me which of your products will work bets? Thank you!
Poster:besembeson
Posted Date:2015-07-22 05:58:42.0
Response from Bweh at Thorlabs USA: Our CaF2 windows have randomly oriented crystal axis so it will not be suitable for white light continuum generation which requires the surface to be perpendicular to the [001] axis.
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?
Window Selection Guide (Table Sorted by Wavelength)
Substrate and Window Type Wavelength Range Available AR Coatings Reflectance over AR Coating Rangea Transmission Data Reflectance Data
Sapphire:
Flat or Wedged
150 nm - 5.0 μm Uncoated -
Raw Data
-
 -D Coating, 1.65 - 3.0 µm Ravg < 1.0% at 0° AOI
Raw Data

Raw Data
 -E1 Coating, 2.0 - 5.0 µm Ravg < 1.50%, Rabs < 3.0% (per Surface, 2.0 - 5.0 µm);
Ravg < 1.75% (per Surface, 2.0 - 4.0 µm) at 0° AOI

Raw Data

Raw Data
Calcium Fluoride (CaF2):
Flat or Wedged
180 nm - 8.0 μm  Uncoated -
Raw Data
-
-D Coating, 1.65 - 3.0 µm Ravg < 1.0%; Rabs < 2.0% at 0° AOI
Raw Data

Raw Data
UV Fused Silica:
FlatWedgedV-Coated Flat, or
V-Coated Wedged
185 nm - 2.1 μm Uncoated
(Flat or Wedged)
-
Raw Data
-
-UV Coating, 245 - 420 nm or 290 - 370 nm (Flat); 245 - 400 nm (Wedged) Ravg < 0.5% at 0° AOI -
Raw Data
-C3 Coating, 261 - 266 nm
(V-Coated)
Ravg < 0.5% at 0° AOI - Click to View Index Plot
Raw Data
-C6 Coating, 350 - 450 nm
(V-Coated)
Ravg < 0.5% at 0° AOI - Click to View Index Plot
Raw Data
 -A Coating, 350 - 700 nm 
(Flat or Wedged)
Ravg < 0.5% at 0° AOI -
Raw Data
 -B Coating, 650 - 1050 nm 
(Flat or Wedged)
Ravg < 0.5% at 0° AOI -
Raw Data
 -C Coating, 1050 - 1700 nm 
(Flat or Wedged)
Ravg < 0.5% at 0° AOI -
Raw Data
Magnesium Fluoride (MgF2):
Flat or Wedged
200 nm - 6.0 μm Uncoated -
Raw Data
-
Barium Fluoride (BaF2):
Wedged 
(Flat BaF2 Windows
Available Below)
200 nm - 11 µm Uncoated -
Raw Data
-
-E1 Coating, 2 - 5 µm  Ravg < 1.25%; Rabs < 2.5%  at 0° AOI
Raw Data
Icon
Raw Data
UV Fused Silica, for 45° AOI:
Flat or Wedged
250 nm - 1.6 µm Coating for 
250 nm - 450 nm
Ravg < 1.0% at 45° AOI info
Raw Data
Coating for
350 nm - 1100 nm
Ravg < 2.0% at 45° AOI info
Raw Data
Coating for
400 nm - 700 nm
Ravg < 1.0% at 45° AOI info
Raw Data
Coating for
600 nm - 1700 nm
Ravg < 1.5% at 45° AOI info
Raw Data
Coating for
700 nm - 1100 nm
Ravg < 1.0% at 45° AOI info
Raw Data
Coating for
1200 nm - 1600 nm
Ravg < 1.0% at 45° AOI info
Raw Data
Infrasil®:
Flat
300 nm - 3 µm Uncoated -
Raw Data
 -
N-BK7:
FlatWedgedV-Coated Flat, or
V-Coated Wedged
350 nm - 2.0 μm Uncoated
(Flat or Wedged)
-
Raw Data
-
 -A Coating, 350 - 700 nm  
(Flat or Wedged)
Ravg < 0.5% at 0° AOI -
Raw Data
-C7 Coating, 400 - 700 nm
(V-Coated)
Ravg < 0.5% at 0° AOI - Click to View Index Plot
Raw Data
-C10 Coating, 523 - 532 nm (V-Coated) Ravg < 0.5% at 0° AOI - Click to View Index Plot
Raw Data
-C11 Coating, 610 - 860 nm (V-Coated) Ravg < 0.5% at 0° AOI - Click to View Index Plot
Raw Data
-B Coating, 650 - 1050 nm 
(Flat or Wedged)
Ravg < 0.5% at 0° AOI -
Raw Data
-C13 Coating, 700 - 1100 nm (V-Coated) Ravg < 0.5% at 0° AOI - Click to View Index Plot
Raw Data
-C14 Coating, 1047 - 1064 nm (V-Coated) Ravg < 0.5% at 0° AOI - Click to View Index Plot
Raw Data
-C15 Coating, 523 - 532 nm
& 1047 - 1064 nm
(V-Coated) 
Ravg < 0.5% at 0° AOI - Click to View Index Plot
Raw Data
-C Coating, 1050 - 1700 nm 
(Flat or Wedged)
Ravg < 0.5% at 0° AOI -
Raw Data
Zinc Selenide (ZnSe):
Flat or Wedged
600 nm - 16 µm Uncoated -
Raw Data
-
-D Coating, 1.65 - 3.0 µm Ravg < 1.0%; Rabs < 2.0% at 0° AOI
Raw Data

Raw Data
-G Coating, 7 - 12 µm
(Only Flat)
Ravg < 1% at 0° AOI
Raw Data

Raw Data
-E3 Coating, 7 - 12 µm
(Only Wedged)
Ravg < 1.0%; Rabs < 2.0% at 0° AOI
Raw Data
Icon
Raw Data
Silicon (Si):
Flat or Wedged
1.2 - 8.0 μm Uncoated -
Raw Data
-
 -E1 Coating, 2 - 5 µm
(Only Wedged)
Ravg < 1.25%; Rabs < 2.5% at 0° AOI
Raw Data
Icon
Raw Data
-E Coating, 3 - 5 µm
(Only Flat)
Ravg < 2% at 0° AOI
Raw Data

Raw Data
Germanium (Ge):
Flat or Wedged
2.0 - 16 μm Uncoated -
Raw Data
-
-C9 Coating, 1.9 - 6 µm
(Only Flat)
Ravg < 2% at 0° AOI
Raw Data

Raw Data
-G Coating, 7 - 12 µm
(Only Flat)
Ravg < 1% at 0° AOI
Raw Data

Raw Data
-E3 Coating, 7 - 12 µm
(Only Wedged)
Ravg < 1.0%; Rabs < 2.0% at 0° AOI
Raw Data
Icon
Raw Data
Barium Fluoride (BaF2):
Flat 
(Wedged BaF2 Windows Available Above)
3 - 5 μm -E Coating, 3 - 5 µm Ravg < 2% at 0° AOI
Raw Data

Raw Data
  • Reflectance is given per surface and each window is coated on both sides.

Calcium Fluoride (CaF2) Windows, Uncoated

Item # WG50530 WG51050
Diameter  1/2" (12.7 mm) 1" (25.4 mm)
Diameter Tolerance +0.0 / -0.2 mm
Thickness 3.0 mm 5.0 mm
Thickness Tolerance ±0.3 mm
Clear Aperture ≥Ø11.43 mm ≥Ø22.86 mm
Parallelism ≤10 arcsec
Transmitted Wavefront Errora ≤λ/8 Over Central 5 mm
≤λ/4 Full Clear Aperture
≤λ/8 Over Central 10 mm
≤λ/4 Full Clear Aperture
Surface Quality 40-20 Scratch-Dig
Wavelength Range 180 nm - 8.0 μm (Uncoated)
Substrate Calcium Fluorideb
Transmission Data Uncoated Transmission
Raw Data
  • Measured at 633 nm
  • Click Link for Detailed Specifications on the Substrate
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
WG50530 Support Documentation
WG50530Ø1/2" CaF2 Broadband Precision Window, Uncoated
$92.00
Today
WG51050 Support Documentation
WG51050Ø1" CaF2 Broadband Precision Window, Uncoated
$118.00
3-5 Days

Calcium Fluoride (CaF2) Windows, AR Coated: 1.65 - 3.0 µm

Item # WG50530-D WG51050-D
Diameter  1/2" (12.7 mm) 1" (25.4 mm)
Diameter Tolerance +0.0 / -0.2 mm
Thickness 3.0 mm 5.0 mm
Thickness Tolerance ±0.3 mm
Clear Aperture >Ø11.4 mm >Ø22.9 mm
Parallelism <10 arcsec
Transmitted Wavefront Errora ≤λ/8 Over Central 5 mm
≤λ/4 Over Full Clear Aperture
≤λ/8 Over Central 10 mm
≤λ/4 Over Full Clear Aperture
Surface Quality 40-20 Scratch-Dig
AR Coating Range 1.65 - 3.0 µm (-D Coating)
AR Coating Reflectanceb Ravg < 1.0%c; Rabs < 2.0% (0° AOI)
Reflectance Data
Raw Data
Transmissiond Tavg > 97%c; Tabs > 92% (0° AOI)
Substrate Calcium Fluoridee
Transmission Data D-Coated Transmission
Raw Data
  • Measured at 633 nm
  • Reflectance is given per surface and each window is coated on both sides.
  • Averaged Over Specified AR Coating Range
  • Total transmission through the optic including coating reflectance and substrate absorption.
  • Click Link for Detailed Specifications on the Substrate
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
WG50530-D Support Documentation
WG50530-DØ1/2" CaF2 Broadband Precision Window, AR Coated: 1.65 - 3.0 µm
$118.00
Today
WG51050-D Support Documentation
WG51050-DCustomer Inspired!Ø1" CaF2 Broadband Precision Window, AR Coated: 1.65 - 3.0 µm
$143.00
Today
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