Laser Research Optics introduced a line of ZnSe laser focusing lenses that come in various focal lengths for 200-W to 4-kW CO2 cutting lasers processing heavy steel plate. The lenses feature focal lengths from 3 in. to 10 in. in 0.5-in. increments. They are offered with a proprietary Cool-Cut coating that absorbs less than 0.15 percent of laser energy to protect against heat damage or with standard A/R coatings providing less than 0.2 percent total absorption. They are suited for OEMs and field replacement.