Two-Photon Absorption (TPA)
Two-photon absorption (TPA) is the simultaneous absorption of two photons of identical or different frequencies in order to excite a molecule from one state to a higher energy electronic state.
Rate ∝ σ_TPA · I²
Last updated: April 13, 2026
Two-Photon Absorption Calculator
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Table of contents
GM
photons / (cm²·s)
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