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At least 2 levels are required in a crystal to achieve population inversion.

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in Engineering Physics II by (679k points)
At least 2 levels are required in a crystal to achieve population inversion.

(a) True

(b) False

The question was asked in a national level competition.

The question is from Pumping Mechanism topic in chapter Laser of Engineering Physics II

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Right option is (b) False

For explanation: Population inversion takes place in crystals with a minimum three-level system. Two level system is not suitable for achieving population inversion because in that case the population of both the levels would remain same as B12 = B21.

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