What is laser-light? Laser light is a beam of light from a laser. :) Laser light is special because it is coherent; the waves are all in sync. Thus it does not naturally spread as normal light does. Laser light can be focused to a point or spread out with mirrors and lenses.
There are many types of lasers, the main difference being the lasing medium. This can be a solid, liquid, or a gas. The first laser used a ruby rod for the lasing medium. A ruby laser has a artificial ruby rod with a mirror at one end and a half coated mirror at the other end. A flash tube, similar to that of a camera?s, puts energy into the ruby, and the ruby emits light. The light bounces back and forth in the ruby rod until it is strong enough to go through the partially coated mirror.
The ruby rod does not conduct heat well, so it must cool down after each shot. This makes it unsuitable for laser-light shows.
He-Ne lasers use a mixture of Helium and Neon gas for the lasing medium. These lasers are normally air cooled, and they can be used continually.
Why are lasers used in the light show? Mirrors used to reflect the light cannot be turned much and still go fast. So, the screen must away from the mirror, so that a little movement will make a noticeable movement on the screen. A regular light beam would dissipate when projected great distances.
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