Material High class CVD ZnSe material US IIVI. Highquality materials ensure more stable laser system; excellent HighPower density endurance. Compatible power 40W200W. Diameter 20mm0.79; Focal Length63.5mm2.5; Thickness2.02.2mm0.08; Transmittance 99.8. Exquisite Coating Process Superb Doublesided solid coating, increase service life, precision slicing, polishing and grinding process, Reduced laser loss, wiping resistant, high temperature resistance, excellent optical properties, high working efficiency. High efficiency CVD ZnSe Laser Focus Lens has smaller focusing spot size, the energy is more concentrated, making the CO2 laser engraving, cutting machine more efficient. Usage CO2 replacement laser lens are mainly used in CO2 laser engraving and cutting well. Lens Shape Planoconvex some meniscus shape may mixed together when manufacturing, but it is the same effect as Planoconvex shape.