This is a short summary of the paper
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Lasers And Their Uses
Start of Term Paper
We have all at some point in our lives used or seen someone use a laser.
They are used in compact disc players for stereos or computers, laser surgery,
laser printers, holography, cutting and borring metals, communication, bar-code
scanners, e .... Middle of Term Paper
... If a photon whose
frequency corresponds to the energy difference between the excited and ground
states strikes an excited atom, the atom is stimulated, as it falls back to a
lower energy state, to emit a second photon of the same frequency, in phase
with and in the same direction as the bombarding photon. This process is
called stimulated emission. The bombarding photon of the emitted photon may
then strike other excited atoms, stimulating further emission of photons, all
of the same frequency and phase. This process produces a sudden burst of
coherent radiation as all the atoms discharge in a rapid chain reaction. The
light beam produces i ... |
| Number of Words: 843 |
Approximate Pages: 4 |
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