• Ø1/2" (12.70 mm) Plano-Convex Spherical Singlet Lenses
• Vacuum-Grade Calcium Fluoride Substrate (Abbe Number: 64.17)
• AR-Coated for the 3 - 5 µm Range (-E Coating)
• Average Reflectance: <2%
• Focal Length: 80 mm
• Surface Quality: 40-20 Scratch-Dig

The LA5458-E Calcium Fluoride (CaF₂) Plano-Convex Lens features an antireflection coating for the 3 - 5 µm range. This coating greatly reduces the surface reflectivity of the substrate, yielding an average transmission in excess of 96.8% over the entire AR coating range. CaF₂ is commonly used for applications requiring high transmission in the infrared and ultraviolet spectral ranges. 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.

Plano-convex lenses focus a collimated beam to the back focus and collimate light from a point source. This lens has a positive focal length and near-best-form shape for infinite and finite conjugate applications. To minimize the introduction of spherical aberrations, light should be bent gradually as it propagates through the lens. Therefore, when using this plano-convex lens to focus a collimated light source, the collimated light should be incident on the curved surface. Similarly, when collimating a point source of light, the diverging light rays should be incident on the planar surface of the lens.

• Lens Shape: Plano / Convex
• Substrate Material: Vacuum-Grade Calcium Fluoride
• Wavelength Range: 3 - 5 µm Range (-E Coating)
• Design Wavelength: 588 nm
• Surface Quality: 40-20 Scratch-Dig
• Surface Flatness (Plano Side): ?/2
• Spherical Surface Power (Convex side): 3?/2
• Surface Irregularity: ?/2
• Abbe Number: v_d=64.17
• Centration: =3 arcmin
• Clear Aperture: >90% of Diameter
• Thickness Tolerance: ±1.0%
• Diameter Tolerance: +0.00 mm / -0.10 mm
• Focal Length Tolerance: ±1%
• Diameter: 1/2" (12.70 mm)
• f: 80 mm
• R: 34.7 mm
• t_c: 2.1 mm
• t_e: 1.5 mm
• f_b: 78.5 mm
• Suggested Fixed Lens Mount: LMR05