Features: High-quality ZnSe Crystal: USA CVD ZnSe material is used in laser engraving and cutting machines up to 500W and provides the best optical performance. Superb Coating: Double-sided solid coating minimizes laser loss and transmits light up to 99.8%. High Precision Process: Excellent Substrate Precise Sling Polishing Grinding. Higher quality and better heat dissipation. Wide Compatibility: Compatible with a wide range of CO2 tube laser engravers and cutters. DiameterFocal LengthEdge ThicknessRecommended12mm25.4/38.1/50.8/63.5mm2mm30-50W15mm50.8/63.5mm50-180W18mm25.4/38.1/50.8/63.5/76.2/101.6/127/160mm19.05mm20mm25 (25.4)mm50.8/63.5/76.2/101.6/127/160mm3mm150-500W Tips: Focus Lens Diameter: Higher power lasers require larger diameter lenses to prevent thermal overload. Focal Length: Focal length affects both spot size and depth of focus. In general, a shorter focal length will produce a smaller focused spot and a shorter depth of focus. How to install: Convex Face to Laser and Concave Face to Carving. Specifications: Material: USA CVD ZnSe Shape: Meniscus Focus Lens Color: Yellow Wavelength: 10.6 um (10600 nm) Diameter: 12/15/18/19.05/20/25mm Diameter tolerance: 0/-0.1mm Focal Length: 25.4/38.1/50.8/63.5/76.2/101.6/127/160/190.5mm Focal Length tolerance: ±2% Transmittance: 99.8% Clear aperture (polished): >90% AR coating reflectivity: <0.2% Warranty: 1 Year Package: 1 x USA CVD ZnSe Focus Lens
