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TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More

5mm Dia. x 1mm Thick, BBAR (2000-5000nm) Coated Barium Fluoride Window

Stock #23-526 New
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Abbe Number (vd):
Axis Orientation:
Protective as needed
Clear Aperture (%):
Clear Aperture CA (mm):
Diameter (mm):
5.00 +0.0/-0.1
Thickness (mm):
1.00 ±0.1
BBAR (2000-5000nm)
Coating Specification:
Ravg <1.5% @ 2000-5000nm
Rabs <3.0% @ 2000-5000nm
Ravg <1.75% @ 2000-4000nm
Coefficient of Thermal Expansion CTE (10-6/°C):
Density (g/cm3):
Fine Ground
Index of Refraction nd:
Knoop Hardness (kg/mm2):
Parallelism (arcmin):
Poisson's Ratio:
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Barium Fluoride (BaF2)
Surface Flatness (P-V):
Surface Quality:
Protective Window
Wavelength Range (nm):
2000 - 5000
Young's Modulus (GPa):

Regulatory Compliance

Certificate of Conformance:

Product Family Description

  • Excellent Transmission from 200nm - 12μm
  • Resistant to High-Energy Radiation
  • Provide High Transmission without AR Coatings

TECHSPEC® Barium Fluoride (BaF2) Windows can be used in a variety of applications, such as infrared spectroscopy, due to their wide broadband transmission that extends from the deep ultraviolet to the long-wave infrared. Barium fluoride’s low index of refraction of 1.48 provides high transmission without the need for anti-reflection coatings. Barium fluoride windows can be used up to 800°C in a dry environment, but prolonged exposure to moisture can degrade transmission in the ultraviolet range. While barium fluoride windows are less resistant to water than calcium fluoride, BaF2 windows are the most resistant optical fluoride to high-energy radiation, but feature lower UV transmittance. BaF2 has a Knoop hardness of 82.

Note: These optical windows are very sensitive to thermal shock.

Barium fluoride is a fast scintillator and can be used to detect X-rays, gamma rays, or other high energy particles such as 511 keV gamma photons in Positron Emission Tomography (PET). BaF2 can also be used to detect high-energy neutrons and separate them from simultaneously occurring gamma photons using pulse shape discrimination techniques.

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