We have a laser engraving machine that uses Nd:YVO4 crystal, Diode pumped, 532 nm laser to sub-pixel engrave inside glass & crystals.
We've recently tried engraving armored glasses with polycarbonate glued in the middle. It indeed engraved, only the engraving is actually black because the polycarbonate is being burnt from the inside.
Here's an example photo of the result.
There's no smoke released from the proccess as far as we can tell, it's all done INSIDE the material.
Now we would like to make sure such a proccess is actually non-toxic and is safe for the operator before doing further testing with polycarbonate.
helpful comments are very appreciated!