II-VI CO2 Laser Meniscus Lens 20mm Dismeter 50.8EFL

Meniscus lenses are designed to minimize spherical aberration producing a minimum focal spot size for incoming collimated light. Specifications Standards Effective Focal Length (EFL) Tolerance ±2% Dimensional Tolerance Diameter: 0.000”-0.005” Thickness: ±0.010” Edge Thickness Variation (ETV) <= 0.002” Clear Aperture (polished) 90% of diameter Surface Figure at 0.63µm Varies depending upon radius Scratch-Dig 20-10 AR Coating Reflectivity per Surface at 10.6µm <= 0.20%