How Lasers Cause Electrons to Form Waves

Lasers are a great way to dump energy into the plasma. Plasmas have tiny little local behavior, but they also have sort of like long distance collective behavior. You can get plasmas to do things like have waves moving through them. And so if you dump a laser beam into it with the right frequency, you can sort of excited to do these waves. The same way you can if you like slap your hand against the surface of a lake and do it at the right frequency,.You can get the lake to like produce these waves.