Optical Grade Calcium Fluoride (CaF2) Lenses and Windows

Calcium Fluoride (CaF₂) is an important optical crystal material widely used in the optical field due to its ultra-broad transmission range from deep ultraviolet (DUV) to mid-infrared (MIR). Calcium fluoride exhibits no significant intrinsic birefringence above 200nm, making it suitable for high-precision polarization optical systems. With low dispersion, high laser-induced damage threshold, and low absorption, it can withstand relatively high-power laser irradiation. It is an ideal material for projection objective lenses and illumination windows in DUV lithography systems, as well as an essential material for high-power UV lasers and excimer laser optics.

Depending on the application scenario, calcium fluoride can be fabricated into various optical components including beam-splitting prisms, windows, and lenses.

Transmission Range: 0.13μm (DUV) ~ 9μm (MIR)

UV Region (<200nm): Transmittance up to >90%, superior to fused silica

IR Region (3-5μm): Transmittance >95%, suitable for thermal imaging systems

Refractive Index: Low and low dispersion (n=1.43 @200nm, n=1.40 @5μm), ideal for broadband anti-reflective coating design