What is Two-Photon Absorption?

Two-photon absorption (TPA) is the simultaneous absorption of two-photons of the same or different wavelenth by a material. In physics two-photon absorption is categorized as a third-order nonlinear optical phenomenon. The image on the left of Figure 1 shows fluorescence emitted through out the path of a laser in a photoactive solution.  This fluorescence results […]

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