25mm Dia. x 3mm Thick, Barium Fluoride Window

Product Details Excellent Transmission from 200nm – 12μm Resistant to High-Energy Radiation Provide High Transmission without AR Coatings TECHSPEC Barium Fluoride (BaF 2 ) 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, BaF 2 windows are the most resistant optical fluoride to high-energy radiation, but feature lower UV transmittance. BaF 2 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). BaF 2 can also be used to detect high-energy neutrons and separate them from simultaneously occurring gamma photons using pulse shape discrimination techniques. Specifications General Type: Protective Window Type of Window: Crystal Physical & Mechanical Properties Clear Aperture CA (mm): 22.50 Diameter (mm): 25.00 +0.0/-0.1 Thickness (mm): 3.00 ±0.1 Parallelism (arcmin): <3 Dimensional Tolerance (mm): +0.0/-0.1 Bevel: Protective as needed Clear Aperture (%): 90.00 Edges: Fine Ground Poisson's Ratio: 0.34 Young's Modulus (GPa): 53 Knoop Hardness (kg/mm 2 ): 82.00 Optical Properties Coating: Uncoated Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More Barium Fluoride (BaF 2 ) Index of Refraction (n d ): 1.48 Surface Quality: 60-40 Abbe Number (v d ): 81.78 Wavelength Range (nm): 200 - 12000 Surface Flatness (P-V): λ/2 Material Properties Density (g/cm 3 ): 4.89 Coefficient of Thermal Expansion CTE (10 -6 /°C): 18.1 Environmental & Durability Factors Operating Temperature (°C): Maximum: 800 Regulatory Compliance RoHS 2015: Compliant × Reach 219: Compliant × Certificate of Conformance: View ×