Protection wavelength range: 1064nm and 532nmum; Visible light transmittance: T%>99.7%;. MCWlaser PVD ZnSe Laser Lens Focus Lens For CO2 Laser Engraver Cutting Machine. Co2 Laser Machine Reflection Mirror & Lens Diam12 18 19 20 25 30mm FL1" 2" 3" 4".
eBay