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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., 6mm Thick, Uncoated, ISP Optics Barium Fluoride (BaF2) Window | BF-W-25-6

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Product Details

Type:
Protective Window
Model Number:
BF-W-25-6

Physical & Mechanical Properties

Bevel:
Protective as needed
Clear Aperture (%):
85
Clear Aperture CA (mm):
21.59
Diameter (mm):
25.40 +0.00/-0.13
Thickness (mm):
6.00 ±0.13
Edges:
Fine Ground
Knoop Hardness (kg/mm2):
82
Parallelism (arcmin):
<3
Poisson's Ratio:
0.343
Young's Modulus (GPa):
53

Optical Properties

Abbe Number (vd):
81.78
Axis Orientation:
Random
Coating:
Uncoated
Index of Refraction nd:
1.48
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
Wavelength Range (nm):
200 - 12000

Material Properties

Coefficient of Thermal Expansion CTE (10-6/°C):
18.1
Density (g/cm3):
4.89

Environmental & Durability Factors

Operating Temperature (°C):
Maximum: 800

Regulatory Compliance

RoHS 2015:
Compliant
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Certificate of Conformance:
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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.