Measuring the Two-Photon Absorption Spectra of Organic Solutions

Measuring the Two-Photon Absorption Spectra of Organic Solutions Via Two-Photon Induced Fluorescence Spectroscopy

Trenton R. Ensley and Ryan M. O’Donnell, CCDC – U.S. Army Research Laboratory, Sensors and Electron Devices Directorate, Adelphi, MD 20783, USA

A team of scientists at the U. S. Army Research Laboratory in Adelphi, M.D., have produced an application note utilising an FS5 Spectrofluorometer and Ti:Sapphire laser in conjunction for Measuring the Two-Photon Absorption Spectra of Organic Solutions Via Two-Photon Induced Fluorescence Spectroscopy. Led by Dr. Trenton R. Ensley and Dr. Ryan M. O’Donnell, they worked with Edinburgh Instruments to provide a modified FS5 sample holder to include a breadboard base and laser-input iris, such that they could mount dedicated optics for steering and focusing the pulsed-laser excitation to the collection focal point of the sample’s emission.

Figure 1. (Left) A diagram of the modified FS5 sample holder for two-photon induced luminescence measurements, (Right) the molar absorbance extinction coefficient, , (dashed line) and 2PA cross section in Göpper-Mayer units, (GM), (squares) for AF455 in THF.

Figure 1. (Left) A diagram of the modified FS5 sample holder for two-photon induced luminescence measurements, (Right) the molar absorbance extinction coefficient, e, (dashed line) and 2PA cross section in Göpper-Mayer units, d(GM), (squares) for AF455 in THF.

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