Lasers and Their Uses
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, etc. Over the past three decades' lasers have become a tool used
daily by many people and they have become very useful in scientific research.
As you can see lasers are a very useful and important tool which is why I have
chosen this topic to write about.
The term laser is an acronym. It stands for "light amplification by
stimulated emission of radiation". They produce a narrow, intense beam of
coherent light.
In a laser the atoms or molecules of a crystal, like ruby or garnet-or
of a gas, liquid, or other substance-are excited so that more of them are at
higher energy levels than are at lower energy levels. If a photon whose
frequency corresponds to the energy difference between the excited and ground
states......
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