China PVD ZnSe Focus Lens is a cheap CO2 focusing lens. This lens is an affordable option for cutting fabric and leather. Because its heat resistance is not as good as USA Znse and II-VI, it is recommended that the power of the laser tube be less than 100w. DiameterFocal LengthThicknesPower18mm38.1/50.8/63.5/76.2mm2.4mm30-100W19.05mm38.1/50.8mm2.4mm20mm38.1/50.8/63.5/76.2/101.6/127mm2.6mm Specifications: Material: China PVD ZnSe (Max 100W) Color: Yellow Wavelength: 10.6 um (10600 nm) Diameter: 18/19.05/20mm Diameter tolerance: 0/-0.1mm Focal Length: 38.1/50.8/63.5/76.2/101.6/127mm Focal Length tolerance: ±2% Transmittance: 99.5% Clear aperture (polished): >90% AR coating reflectivity: <0.3% Warranty: 1 Year Package: 1 x PVD CVD ZnSe Focus Lens
