Lasers Lazers Lasers are powerful beams of light that have uses in industry , science , communications , military and medicine .
Ordinary light has many wavelengths that go off in all directions.
A laser is able to generate light that has a single wavelength all traveling in the same direction and all in step with each other. It is pure in color and extremely intense. The light can come out less than 0.001inches in diameter. The first laser was made from a ruby rod, mirrors and a xenon flash tube. Intense light from the flash tube excites electrons in the ruby's chromium atoms.