Two-photon absorption

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In atomic physics, two-photon absorption (TPA or 2PA), also called two-photon excitation or non-linear absorption, is the simultaneous absorption of two photons of identical or different frequencies in order to excite an atom or a molecule from one state (usually the ground state), via a virtual energy level, to a higher energy, most commonly an excited electronic state.

Excerpt from the Wikipedia article “Two-photon absorption”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: BP-Aegirsson, CC BY-SA 4.0, via Wikimedia Commons.