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Lasers
Beginning of essay
The laser is a device that a beam of light that is both scientifically
and practically of great use because it is coherent light. The beam is produced
by a process known as stimulated emission, and the word "laser" is an acronym
for the phrase "light amplification by stimulated emission of radiati ....
Middle of essay
.... states, or energy levels, of which it may consist. An example
of the energy states could be pictured as a unevenly spaced ladder which the
higher rungs mean higher states of energy and the lower rungs mean lower states
of energy. If left disturbed for a long time the atom will reach its ground
state or lowest state of energy. According to quantum mechanics there is only
one light frequency that the atom will work with. There are three ways that the
atom can deal with the presence of light e.... |
| Number of words: 757 |
Approximate pages: 3 |
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