I have a 80 watt laser that I would like to power down for engraving, not by lowering power but by using some kind of glass or crystal that would block the beam somewhat, any ideas.
Put in a “Dimming target” in the beam-path basically its a cross-hair made of copper (or the like) This will absorb some of the energy and “dimm” the power going down-stream. The thicker the wire, more dimming effect. But be sure that the target can dissapate the heat !!