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Introduction - About Laser Beam
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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 |
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 |
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