I have laser engraved and cut black granite with a 2000 watt co2 laser as an application engineer for a major co2 laser machine tool manufacturer, I got some free time to play and I did it in my first attempt too. When people tell me you can’t cut rock a .5 thick with a laser I say let me try it, got access to a 2000 watt co2 or a fiber laser? I have cut a slab of concrete with crushed auto glass fill in it at 2000 watts cw and high pressure n2 at 9 bar at 22 ipm with a 7.5 inch focal length lens at a zero focus on a slab of this concrete mix for a slump mold for a glass shop that made wind shields for their prototype cars they built for virtually every car manufacturer on earth. And I got paid to play with millions of $ of lasers to boot! It was fun too. Extensive Travel required.