CaF₂ Window BBAR(2-5μm)

Features:

• High transmittance across 2–5 μm MWIR band
• Low refractive index with minimal Fresnel loss
• High laser-induced damage threshold
• Excellent coating adhesion & environmental stability

Uncoated CaF₂ has a refractive index of ~1.43 at 3 μm, with inherently low Fresnel reflection loss at each surface. Our 2–5 μm BBAR coating further reduces surface reflectance to below 1% per surface, boosting average transmission to over 94% across the working band. The coating exhibits good adhesion and environmental stability, suitable for long-term operation in industrial and laboratory environments.

Typical Applications

• 3–5 μm MWIR thermal imaging systems
• Fourier transform infrared spectroscopy (FTIR) instruments
• Infrared gas detection and analytical equipment
• Mid-infrared laser systems and optical instrumentation
• Medical infrared diagnostic and surgical devices
• Industrial IR temperature measurement and monitoring