The Power of Light:
How a Laser Works
what do most
people know about laser? What's the first thing that comes to mind?
STAR WARS? LIGHT SABERS?
The word laser means “light amplification by stimulated emission of radiation.” Lasers work because of the interaction of light with electrons. Electrons near the outside of an atom have a higher energy level. When an electron moves to the inside of the atom it looses energy. This extra energy is given off as light. The amount of energy released determines the color of the light. Longer wavelengths mean colors near the red end of the spectrum and shorter wavelengths mean colors near the voilet end of the spectrum.
laser was called the
ruby laser was invented in 1960. A