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What is population inversion? Explain its significance in the operation of LASER. Why is it called state of negative temperature?
written 6.4 years ago by gravatar for vermavarsha432 vermavarsha432 • 1000 modified 4.1 years ago by gravatar for sanketshingote sanketshingote • 100
advanced engineering physics
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written 6.3 years ago by gravatar for vermavarsha432 vermavarsha432 • 1000 modified 6.1 years ago by gravatar for awari.swati831 awari.swati831 • 100

Usually atoms have the tendency to return to ground state releasing the absorbed energy. Hence, the population of atoms in ground state is greater than that of excited state. For laser action, there should be more number of atoms in higher energy state.

Artificially creating more number of atoms in …

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