LASER IS THE ABBREVIATION FOR LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATIONLasers are devices that produce intense beams of light which
Recognized as one of the top ten technological achievements of the twentieth century.
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.
Be gentle and you can be bold but also let people feel, the steadiness of your resentment;
be frugal and you can be liberal;
avoid putting yourself before others and you can become a leader among men.
Department of ETE