Brought to you by the students of P. A. Wiedorn at Wilde Lake High School
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A LASER is a machine that sends out a powerful beam of light. It is often thought of as an optical oscillator. Optical means light, and oscillate means to change back and forth. The word LASER means.
A MPLIFICATION by
E MISSIONS of
LASERS work throughout the visible light spectrum and below it to microwaves, and above it to X-rays. Some LASERs are visible, some are not.
MONOCHROMATIC is light that is only one color. The color will be different with different kinds of lasers. Ordinary light is made up of many different colors. You can see this by using a prism.
Laser light is DIRECTIONAL - it doesn't spread out. A powerful laser is beamed at the moon - 250,000 miles from earth. The beam spread out less than 2 miles by the time it got to the moon.
Laser light is COHERENT. Ordinary light is a jumble of different wave-lengths. Laser light is just one, and they are in step with each other.
Because the light beams are the same and travel together, there is more energy in the beam, making the light very, very, BRIGHT.