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What did Dr. Evil mean...? |
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So what is a laser? Most people have seen lasers being used in CD
players, as laser pointers at presentation, or even laser light
shows... those of you in trade and industry will be aware of laser
levelling and laser cutting... and then there are the medical
applications too!
Well, here you go: the word "LASER" is an abbreviation for "Light Amplification by Stimulated Emission of Radiation". A laser is a device that produces coherent light.
A line laser generates an exact, straight line for long distances with
a very intense colour. In the beginning line lasers were made with gas
tubes (Helium-Neon lasers) that was stimulated by high-voltage.
Nowadays, lasers use semiconductor laser diodes for generating their
light. The used gas or other medium determines the corresponding colour
of the laser light (usually red or green). |
