Engis has developed a new process for polishing a variety of laser-grade optical surfaces. The process uses diamond slurry and composite polishing plates to polish surfaces made of zinc selenide, zinc sulfide, germanium, silicon, calcium fluoride or magnesium fluoride. The company said this enables manufacturers to rapidly change between different materials, reducing setup times and costs, and eliminates edge rounding normally associated with pad polishing. The system causes fewer visual sleeks, according to Engis, while achieving surface flatness to λ/8 and a scratch-dig rating of 20-10. For more information, visit www.engis.uk.com.