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Unformatted text preview: plitude in the electric and magnetic fields. As a
particle, bright light would be explained by a large number of photons. Coherent Light
Lamps, flashlights, etc… all produce light. But this light is released in
many directions, and the light is very weak and diffuse. In coherent
light the wavelength and frequency of the photons emitted are the
same. The amplitude may vary. Such things as lasers and
holograms are composed of coherent light.
Incoherent Coherent Lasers
Laser stands for light amplification by stimulated emission of
radiation. A laser is a device that creates and amplifies a narrow,
intense beam of coherent, monochromatic (one wavelength) light.
Here’s how they work.
There are 2 primary states for an atom, an excited state and a
ground state. The ground state is the lowest energy, most stable
state. In the excited state electrons are in a higher energy level. In a
laser, the atoms or molecules of a crystal (such as ruby) or of a gas,
liquid, or other substance are excited in the laser cavity so...
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This note was uploaded on 11/17/2011 for the course PHYS 121 taught by Professor Burgeson during the Fall '11 term at BYU.
- Fall '11