Lights & Lasers

A laser is an optical device that produces coherent radiation. The term "laser" is an acronym: Light Amplification by Stimulated Emission of Radiation. A typical laser emits light in a narrow, low-divergence beam and with a well-defined wavelength (i.e. monochromatic) (corresponding to a particular color if the laser is operating in the visible spectrum). This is in contrast to a light source such as the incandescent light bulb, which emits into a large solid angle and over a wide spectrum of wavelength.

(reference: http://en.wikipedia.org/wiki/Lasers)
 

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