LASER IS THE ABBREVIATION FOR LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION
Recognized as one of the top ten technological achievements of the twentieth century.
Lasers are devices that produce intense beams of light which
are monochromatic, coherent, and highly collimated. The wavelength
(color) of laser light is extremely pure (monochromatic) when compared
to other sources of light, and all of the photons (energy) that
make up the laser beam have a fixed phase relationship (coherence)
with respect to one another. Light from a laser typically has very
low divergence. It can travel over great distances or can be focused
to a very small spot with a brightness which exceeds that of the
sun. Because of these properties, lasers lasers are used in a wide variety
of applications in all walks of life.
