In portal 2 reloaded. I was able to have the laser beam go through the portals. This made them lap over them selfs ten times revealing that in portal there are ten
Triple Laser - Valve Developer Community
Thermal Discouragement Beam - Valve Developer Community
E3 Laser Stuff [Portal 2] [Mods]
PC / Computer - Portal 2 - Laser Receiver - The Models Resource