Introduction - About Laser Beam
Introduction
About laser
LASER is an acronym from "Light A mplification by Stimulated Emission of Radiation".
It is a device which radiates coherent light by excitation of molecules in a gas, or electrons in a solid, to a high energy stage and their release of this energy in the form of light after amplification by to and fro oscillations.
A laser beam has the following features.
(1) | Monochromatic |
(2) | Low divergence |
(3) | High energy density |
(4) | Coherent in phase |
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Types of lasers
Examples of materials which are used to emit laser beam are as follows.
Liquid |
: |
Pigment |
Gas |
: |
He-Ne, Ar and CO2 |
Solid |
: |
YAG, Ruby and Glass |
Semiconductor |
: |
GaAs |
<Laser beam wavelength> |
|
|
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Download
- laser_e.pdf
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