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High Power CO2 Laser Focus Lens Engraver II-VI ZnSe Material Diam:20mm FL:25.4mm Be suitable for High Power CO2 laser 100w or above Feature ?Withstanding high power density. ?Compact and wearable film coating. ?Double-side thick coating with laser transmittance reaching 99%25 on the position of wavelength 10.6um Parameter Focus Lens Thinckness: about 2mm (Please indicate if need 3mm ) Material: High Class Znse material Item no: Wavelength Focal length(mm) Diameter(mm) Material Type CL-4518/4519/4520 10.6 45 18/19/20 Znse MFM CL-5018/5019/5020 10.6 50.8 18/19/20 Znse MFM CL-6318/6319/6320 10.6 63.5 18/19/20 Znse MFM CL-8018/8019/8020 10.6 80 18/19/20 Znse MFM CL-1018/1019/1020 10.6 100 18/19/20 Znse MFM Application: 30W,40W,50W,60W,80W,100w,130w,150w CO2 laser (10600uM); compatible with All CO2 laser engraver from China.