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All Products / Optics / Windows and Diffusers / UV and IR Windows / ISP Optics Barium Fluoride (BaF2) Windows
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25.4mm Dia., 5mm Thick, Uncoated, ISP Optics Barium Fluoride (BaF2) Window | BF-W-25-5

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Abbe Number (vd):
81.78
Axis Orientation:
Random
Bevel:
Protective as needed
Clear Aperture (%):
85
Clear Aperture CA (mm):
21.59
Diameter (mm):
25.40 +0.00/-0.13
Thickness (mm):
5.00 ±0.13
Coating:
Uncoated
Coefficient of Thermal Expansion CTE (10-6/°C):
18.1
Density (g/cm3):
4.89
Edges:
Fine Ground
Index of Refraction nd:
1.48
Knoop Hardness (kg/mm2):
82
Operating Temperature (°C):
Maximum: 800
Parallelism (arcmin):
<3
Poisson's Ratio:
0.343
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Barium Fluoride (BaF2)
Surface Flatness (P-V):
2λ
Surface Quality:
40-20
Type:
Protective Window
Wavelength Range (nm):
200 - 12000
Young's Modulus (GPa):
53
Model Number:
BF-W-25-5

Regulatory Compliance

RoHS 2015:
Compliant
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Certificate of Conformance:
View
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Reach 240:
Compliant
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Product Family Description

  • Excellent Transmission from 0.2 - 12μm
  • Resistant to High-Energy Radiation
  • High Transmission without AR Coatings

ISP Optics Barium Fluoride (BaF2) Windows provide excellent transmission from 0.2- 12μm without the need for an Anti-Reflection (AR) coating due to its low index of refraction. Barium Fluoride has similar physical properties to Calcium Fluoride, but features higher resistance to high-energy radiation. This makes Barium Fluoride ideal for vacuum UV (VUV) applications such as thermography or laser spectroscopy where high radiation resistance is required. ISP Optics Barium Fluoride (BaF2) Windows can be used up to 800°C in a dry environment, but prolonged exposure to moisture can degrade transmission in the ultraviolet range.

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