• Vacuum-Grade Calcium Fluoride Substrate
• Diameter: Ø1" (25.40 mm)
• Uncoated for 0.18 - 8.0 µm Transmission
• Focal Length: -150 mm

Thorlabs' Ø1" Calcium Fluoride (CaF₂) Negative Meniscus Lens offers high transmission from 180 nm to 8.0 µm. The lens is offered uncoated, while a broadband AR-coated version for the 3 - 5 µm spectral range is available.

CaF₂ is commonly used for applications requiring high transmission in the infrared and ultraviolet spectral ranges. Its extremely high laser damage threshold makes it useful for use with excimer lasers. The material exhibits a low refractive index, varying from 1.35 to 1.51 within its usage range of 180 nm to 8.0 µm. Calcium fluoride is also fairly chemically inert and offers superior hardness compared to its barium fluoride, magnesium fluoride, and lithium fluoride cousins.

• Material: Vacuum-Grade Calcium Fluoride
• Wavelength Range: 0.18 - 8.0 µm
• Diameter Tolerance: +0.00/-0.10
• Thickness Tolerance: ±0.1 mm
• Focal Length Tolerance: ±1%
• Surface Quality: 40-20 Scratch-Dig
• Spherical Surface Power: 3λ/2
• Spherical Surface Irregularity: λ/2
• Centration: ≤3 arcmin
• Clear Aperture: =90% of Diameter
• Design Wavelength 4 µm
• Diameter: Ø1" (25.40 mm)
• f: -150 mm
• R₁: 64.1 mm
• R₂:30.8 mm
• t_c: 4 mm
• t_e: 5.5 mm
• f_b: -147.3 mm
• Suggested Mount: LMR1