The II-VI ZnSe focus lens adopts the II-VI zinc selenide for substrate and applied AR coatings on both sides.
The CO2 Laser Focus Lens of 20mm Dia. / 38.1mmFL is made by Yongli's strategic partner the US II-VI Infrared, due to the shorter focal length of the lens, it normally used for high precise engraving or thin materials cutting jobs.
Gently and smoothly clean both sides of the CO2 focus lens and make sure there is NO dust, fingerprint and contamination by air-borne particles etc. Such contaminations may cause the lens coating damage by the high-power laser beam within no time.