About Cold Laser
The word "laser" stands for "light amplification by stimulated emission of radiation." Lasers are possible because of the way light interacts with electrons. Electrons exist at specific energy levels or states characteristic of that particular atom or molecule. The energy levels can be imagined as rings or orbits around a nucleus. Electrons in outer rings are at higher energy levels compared to those in the inner rings. Electrons can be bumped up to higher energy levels by the injection of energy-for example, by a flash.