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Updated: Jun 4, 2026

Dissection and 2-Photon Imaging of Peripheral Lymph Nodes in Mice
Published on: August 23, 2007
Two-photon and two-photon-assisted slow light
E Sánchez Bautista1, E Cabrera-Granado, R Weigand
1Departamento de Óptica, Facultad de Ciencias Físicas, Universidad Complutense de Madrid, Madrid, Spain.
Abstract:
We show that light pulses propagating in two-photon absorbing systems may present time delays like slow light produced via coherent population oscillations in one-photon interactions. Two regimes are numerically studied for a simplified two-level system: (a) a light pulse at frequency ω/2 undergoes two-photon absorption (TPA) and is delayed by the absorbing system (two-photon slow light) and (b) a light pulse at frequency ω is delayed in a system prepared by TPA of a light pulse at frequency ω/2 (two-photon-assisted slow light). The study carried out in solutions of dyes and dendrites shows significant delays, low distortion, and good transmission for easily reachable experimental conditions. The working principle can be applied to other media and can be used in telecommunications technology.
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