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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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