Can PVC film be lasered up?
I’m going to explain to him what a laser is. There are different numbers of particles (electrons) distributed at different energy levels. The particles at high energy levels are excited by a certain photon and will jump from high energy level to (transition) to low energy. At this time, it will radiate light of the same nature as the light that excites it, and in a certain state, a weak light can excite a strong light. This is called 'light amplification by stimulated radiation', or laser for short.