Population Inversion - The Interaction of Light With Matter

The Interaction of Light With Matter

There are three types of possible interactions between a system of atoms and light that are of interest:

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    Here is this vast, savage, howling mother of ours, Nature, lying all around, with such beauty, and such affection for her children, as the leopard; and yet we are so early weaned from her breast to society, to that culture which is exclusively an interaction of man on man,—a sort of breeding in and in, which produces at most a merely English nobility, a civilization destined to have a speedy limit.
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