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Potassium Bromide Windows


  • Uncoated KBr Substrate
  • 250 nm - 26 µm Wavelength Range
  • Ø12.5 mm or Ø25.0 mm Size


WG10123

(Ø12.5 mm)

WG10255

(Ø25 mm)

Related Items


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Flat 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
250 nm - 26 µm Potassium Bromide (KBr)
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.

Features

  • Ø12.5 mm and Ø25.0 mm Versions Available
  • Uncoated Potassium Bromide
  • 250 nm - 26 µm Wavelength Range

Thorlabs' Potassium Bromide (KBr) Precision Windows are available in Ø12.5 mm and Ø25 mm sizes. Potassium bromide features high transmission across an extremely broad wavelength range as well as high resistance to mechanical shock and temperatures up to 300 °C. However, KBr is water-soluble, so the window should be safeguarded from moisture including high humidity environments. The broad transmission range makes KBr windows excellent for use in FTIR spectroscopy.

When handling optics, one should always wear gloves. This is especially true when working with potassium bromide as any excess moisture can damage the surface.

Thorlabs also offers precision windows fabricated from other substrates for use in a large variety of laser and industrial applications. For our complete selection, see the Flat Window Selection Guide table to the right. We also offer laser windows, which have AR coatings centered around commonly used laser wavelengths, and Brewster windows, which are designed to eliminate P-polarized reflected light.

Item # WG10123 WG10255
Diameter 12.5 mm 25.0 mm
Diameter Tolerance +0.0 / -0.1 mm
Thickness 3.0 mm 5.0 mm
Thickness Tolerance ±0.5 mm
Clear Aperture >Ø11.25 mm >Ø22.50 mm
Parallelism <30 arcsec
Surface Flatness <4λ at 633 nm over Clear Aperture
Surface Quality 60-40 Scratch-Dig
Substrate Potassium Bromidea
Transmission Data
  • Click Link for Detailed Specifications on the Substrate
Optic Cleaning Tutorial Optical Coatings Guide

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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:
Flat, Wedged, V-Coated Flat,
or V-Coated Wedged
185 nm - 2.1 μm Uncoated
(Flat or Wedged)
-
Raw Data
-
-UV Coating,
245 - 400 nm
(Flat or 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
Potassium Bromide (KBr):
Flat
250 nm - 26 µm Uncoated - -
Infrasil®:
Flat
300 nm - 3 µm Uncoated -
Raw Data
-
N-BK7:
Flat, Wedged, V-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
-E4 Coating, 2 - 13 µm
(Only Flat)
Ravg < 3.5%; Rabs < 6% at 0° AOI
Raw Data

Raw Data
-E2 Coating, 4.5 - 7.5 µm
(Only Flat)
Ravg < 1.0%; Rabs < 2.0% 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
-G Coating, 7 - 12 µm
(Only Flat)
Ravg < 1% at 0° AOI
Raw Data

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.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
WG10123 Support Documentation
WG10123NEW!Ø12.5 mm KBr Broadband Precision Window, 3.0 mm Thick, Uncoated
$62.00
5-8 Days
WG10255 Support Documentation
WG10255NEW!Ø25.0 mm KBr Broadband Precision Window, 5.0 mm Thick, Uncoated
$72.00
Lead Time
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