Make it three piece.....
Use solid black acrylic say 1/16" thick and make open rectangle border around the laserlights. Adhere to the clear acrylic. I would think that would keep light from shining around the laserlight/acrylic intersection. (If I understand your problem)
Woodworking, Old Tools and Shooting
Ray Fine RF-1390 Laser Ray Fine 20watt Fiber Laser
SFX 50 Watt Fiber Laser
PM2000, Delta BS, Delta sander, Powermatic 50 jointer,
Powermatic 100-12 planer, Rockwell 15-126 radial drill press
Rockwell 46-450 lathe, and 2 Walker Turner RA1100 radial saws
Jet JWS18, bandsaw Carbide Create CNC, RIA 22TCM 1911s and others