Barium Fluoride Window
Barium fluoride (BaF2) has nearly 90% transmission over 200-9500nm and is commonly used for lenses, beamsplitters, filters, prisms, and windows in cryogenic imaging and laser systems. It is somewhat water-soluble and suitable only for dry environments. BaF2 is described as not found naturally and requiring chemical synthesis, making BaF2 relatively costly. Brittle and very thermal-shock-sensitive, it polishes well and can be etched. Highest-purity VUV material reaches fast-scintillation grade. Applications: spectral components, commonly passive-infrared 8-14μm viewports for thermal imaging. At equal thickness, infrared transmission extends approximately 1μm beyond CaF2. Highest-quality BaF2 is also used as the fastest known scintillator in high-energy physics. Barium fluoride serves optical materials, coatings, and specialized components. First, high transmission and low index support optical materials. Good transmission over 0.15μm-14.5μm enables UV/IR windows and components from far-UV to long-wave IR, including lenses, beamsplitters, filters, prisms, and windows. Second, coating layers improve transmission and reduce interface reflections. Moderate index and combinations with other materials tune coating index for reduced reflection or increased transmission. High chemical/thermal stability also supports use as a stabilizer improving corrosion and thermal-shock resistance. Finally, specialized components include windows in infrared imaging/surveillance, thermometry, remote sensing, and infrared spectroscopes, where they are widely used2. Broad visible/infrared coverage also serves thermal imaging/night vision with integrated VIS channels, astronomical optics, infrared laser optics, and high-energy γ-ray scintillators. Overall, excellent optics and chemical/thermal stability make barium fluoride suitable for many optical materials, coatings, and specialized components.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Machinable Shapes | Circular, Rectangular, Polygonal and Other Shapes |
| Size Range - Diameter (Maximum Diagonal) | Φ8-Φ80mm |
| Size Range - Thickness | 0.05-50mm |
| Surface Figure PV | Reflected PV Better Than 1/4λ, Transmitted PV Better Than 1/10λ |
| Surface Finish | 10-5 20-10 40-20 |
| Surface Roughness | Less Than 5nm |
| Parallelism | Less Than 20″ |
| Coating | Coating Customizable to Customer Requirements |
| Density | 4.89 g/cm3 |
| Melting Point | 1280 ℃ |
| Coefficient of Thermal Expansion [-100……+200] | 1.81*10⁻⁶@-100……+200 |
| Purity | 99.9996 % |
| Bulk Modulus | 56.4 GPa |
| Shear Modulus | 25.4 GPa |
| Thermal Conductivity [286K] | 11.72@286K |
| Heat Capacity [300K] | 0.410@300K |
| Knoop Hardness | 82 kg/mm² |
| Water solubility | 1.7 g/l |
| Young's Modulus | 53.07 GPa |
| Poisson’s Ratio | 0.343 |
| Transmission Wavelength Range | 150nm-12500nm |
| Absorption Coefficient [632.8nm] | 3.2*10⁻⁶@632.8nm |
| Thermo-Optic Coefficient dn/dT [400nm] | -15.2*10⁻⁶%@400nm |
| Thermo-Optic Coefficient dn/dT [3390nm（-60℃）] | -12.7*10⁻⁶%@3390nm（-60℃） |
| Thermo-Optic Coefficient dn/dT [3390nm（+60℃）] | -15.2*10⁻⁶%@3390nm（+60℃） |
| Refractive Index (n) [260nm] | 1.51 |
| Refractive Index (n) [5140nm] | 1.45 |
| Refractive Index (n) [300nm] | 1.50 |
| Refractive Index (n) [6500nm] | 1.44 |
| Refractive Index (n) [360nm] | 1.49 |
| Refractive Index (n) [8000nm] | 1.43 |
| Refractive Index (n) [480nm] | 1.48 |
| Refractive Index (n) [8600nm] | 1.42 |
| Refractive Index (n) [850nm] | 1.47 |
| Refractive Index (n) [9200nm] | 1.41 |
| Refractive Index (n) [3240nm] | 1.46 |
| Refractive Index (n) [9800nm] | 1.40 |
Applications
Datasheet
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Supplier Information
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