1. #1
    NEELAMBARI
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    What is meant by Population Inversion?

    hi
    what is meant by population inversion?





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  3. #2
    Govind8644
    Join Date
    Apr 2012
    Location
    Delhi
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    Re: What is meant by Population Inversion?

    POPULATION INVERSION is the codition of having enough excited or high energy states distributed in a material that a chain reaction of stipulated emission can occur.
    OR
    POPULATION INVERSION occurs when a system i.e group of atoms or molecules are present in such a state that more members are present in excited state than present in lower state.
    Population-inversion-3level.png

    Laser needs a constant power source that maintains Population Inversion in order to generate radiation continuously because each stimulated emission reduces the population of high energy states.
    550px-Stimulated_Emission.svg.jpg

    The production of Population Inversion is necessary step in working of standard Laser.




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