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Essay Archive - The Laser
The Laser
Before we can learn about the laser we need to know a little bit about
light (since that is what a laser is made of). Light from our sun, or from an
electric bulb, is called white light. It is really a mixture of all the
different colours of light. The colours range from violet, indigo, and blue, to
green, yellow, orange, and red. These make up the visible part of the
electromagnetic spectrum. Light is made up of particles, called PHOTONS, which
travel in waves. The difference in the colour depends on the wavelength of the
light. Violet light has the shortest wavelength while red has the longest. There
are other par....
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