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| Definition | : | Two-Photon Absorption |
| Category | : | Academic & Science » Physics |
| Country/ Region |
: | Worldwide
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| Popularity | : |
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Two-Photon Absorption (TPA or 2PA) is a third-order nonlinear optical phenomenon in which a molecule absorbs two photons at the same time, exciting an atom or ion to a higher-lying state, with the energy increase being equal to the sum of the photon energies.
The full form of TPA is Two-Photon Absorption
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