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help needed to sort out the degree of population inversion

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athar_s

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plz solvw this problem and give its solution

Given that the life time of the upper level of the λ=632.8 nm transition in He-Ne
laser is 1*10^-7 sec,calculate the degree of population inversion required to give a gain coefficient of 0.07 /m ignoring line-broadening effect.

ans=4.39*10^5 /m³
 

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