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Answer by sleepy for Why don't we directly excite atom to the meta-stable...
In the three-level configuration, the lifetime of the meta-stable state needs to be very large. If it is not true, then it's impossible to create population inversion: atoms at this level (which we...
View ArticleWhy don't we directly excite atom to the meta-stable state in laser physics?
I started reading about laser physics, in various cases (online as well as in books) the atoms are first excited to an "excited" state which is less stable and decays into a more stable "meta-stable"...
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