Intbuying ZnSe Focus Lens for CO2 Laser Engraver/Cutter 12mm Dia Cutting Machine FL 50.8mm
https://buyyou.net/cbe/data/prd/130/043/130043-2.pnghttps://buyyou.net/cbe/data/prd/130/043/130043-3.png ZnSe is used for optical windows, lenses, mirrors, prisms and optical blanks, plates, disks, sheets, slabs particularly for infrared applications.
　
https://buyyou.net/cbe/data/prd/130/043/130043.jpg
Specification:

Type: CO2 Laser Lens

Color: Yellow

Material: ZnSe

Diameter: 12mm

Thickness: 2mm

Wave Length:10.6um

Focal Length: 50.8mm