Apologies in advance if this has already been suggested; searching with laser in the keywords wasn't much help...
Has anyone experienced laser-light going through polycarb, either clear or transp-white?
What I'm thinking about is using transp-white with lasers pointing up the blade through the material of the blade itself, so that the beams are nicely visible (they'd likely need to be red for the design I'm considering, unfortunately)
My initial concern is that if the laser is powerful enough to reach the tip, then it's also going to start burning the plastic.
It would surprise me if I was the first to think of this though, so I thought I'd ask around...