Calcium Fluoride (CaF₂) Optical Glass Substrates & Windows

Calcium Fluoride (CaF₂) is a high-performance optical material widely used for manufacturing precision crystal substrates and optical windows. Synthesized through artificial crystal growth, it is prized for its exceptional transparency across a broad spectral range, extending from the ultraviolet (UV) through the visible and into the infrared (IR) spectrum (approximately 180 nm to 8 μm).

One of the key properties of CaF₂ is its high laser damage threshold, making it an ideal choice for high-power laser applications. It exhibits low absorption and refractive index, which minimizes surface reflection losses and enhances transmission efficiency. Furthermore, it has excellent water insolubility and chemical stability compared to other halide crystals, ensuring durability in various operating environments.

CaF₂ windows are essential components in excimer laser lithography, spectroscopy, and thermal imaging systems. They are also commonly used as substrates for thin-film coatings and in cryogenic applications due to their ability to withstand thermal shock. With its outstanding optical clarity and mechanical robustness, Calcium Fluoride remains a fundamental material for advanced photonics and scientific research.

Broad Transparency: Excellent transmission from UV (180 nm) to IR (8 μm).

High Laser Damage Threshold: Ideal for high-power laser applications.

Low Refractive Index: Minimizes reflection losses (low surface scatter).

Low Absorption: Ensures high internal transmission efficiency.

Chemical Stability: Insoluble in water and resistant to common chemicals.

Mechanical Durability: Relatively hard and resistant to thermal shock.