BBAR (2000-5000nm) Coated Barium Fluoride (BaF2) Window

Description

Shape Optics’ Barium Fluoride (BaF2) Windows are high-performance optical components designed for a broad range of applications, particularly in infrared spectroscopy. Known for their excellent transmission properties, these windows cover a wide spectral range from the deep ultraviolet (UV) to the long-wave infrared (LWIR).

Properties and Uses

BaF2 windows are extensively used in applications requiring high-energy radiation resistance and broad spectral coverage. They are ideal for infrared spectroscopy, X-ray detection, and use in environments exposed to high-energy particles. Despite their sensitivity to thermal shock, BaF2 windows can operate up to 800°C in dry environments.

General Specifications

• Material: Barium Fluoride (BaF2)
• Clear Aperture: 90%
• Coating: BBAR (2000-5000nm)
• Edges: Fine Ground
• Bevel: Protective as needed
• Type: Protective Window

Physical Properties

• Density: 4.89 g/cm³
• Young’s Modulus: 53 GPa
• Coefficient of Thermal Expansion (CTE): 18.1 x 10⁻⁶/°C

Mechanical Properties

• Knoop Hardness: 82 kg/mm²
• Poisson’s Ratio: 0.343
• Surface Flatness: λ/2
• Parallelism: < 3 arcmin

Chemical Properties

Barium Fluoride is highly resistant to high-energy radiation, making it suitable for use in harsh environments. However, it is less resistant to water than other materials like Calcium Fluoride, and prolonged exposure to moisture can degrade its transmission in the UV range. BaF2 can detect X-rays, gamma rays, and high-energy particles, and it also functions as a fast scintillator.

Optical Properties

• Index of Refraction: 1.48
• Abbe Number (νd): 81.78
• Surface Quality: 60-40 scratch-dig

Transmission Wavelength Range

BaF2 windows offer excellent transmission from 200 nm to 12,000 nm, making them versatile for a wide range of optical applications. This broad spectral range covers both the UV and IR regions, ensuring high performance across multiple wavelengths.

Shape Optics’ Barium Fluoride (BaF2) Windows are engineered to deliver superior optical performance with high transmission across a broad spectral range. Their resistance to high-energy radiation and wide wavelength coverage make them ideal for advanced optical systems. Proper handling and storage are essential to mitigate their sensitivity to thermal shock and moisture.