I recently acquired a Shapeoko 3 XL and a friend of mine approached me about doing a project that would require wood burning engraving. I've read about a couple different types of lasers that work, but I'd also like to have an understanding of the approach. Most have said 800mw is the minimum for burning, but the nm range differs greatly. So I understand the watts is relative to the power/intensity of the laser, but I don't understand what part the nm part plays and I love to know.
Second, does anyone have any recommendations of places to purchase in the US that I could purchase a unit for $100-$125?
Thanks for your help