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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1994),
  • paper CTuK11

Differential thermal lensing to study two-photon absorption spectra in solutions

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Abstract

Thermal lensing is a sensitive technique to observe small refractive index changes due to linear or nonlinear absorption.1 That enables to do two-photon absorption (TPA) spectroscopy that can be applied to nonluminescent substances where the technique of two-photon excited luminescence does not work. Nonradiative relaxation of excitation in such subjects gives rise to effective heat generation. The main obstacle, that has to be overcome is the suppression of the contribution brought by solvent molecules to be heated through the absorption.

© 1994 Optical Society of America

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