Two-photon-absorption-induced nonlinear absorption in fluorene oligomers

Remi Anemian; Jean-Christophe Mulatier; Chantal Andraud; Yannick Morel; Olivier Stephan; Patrice L. Baldeck

doi:10.1117/12.453562

14 February 2003 Two-photon-absorption-induced nonlinear absorption in fluorene oligomers

Remi Anemian, Jean-Christophe Mulatier, Chantal Andraud, Yannick Morel, Olivier Stephan, Patrice L. Baldeck

Proceedings Volume 4797, Multiphoton Absorption and Nonlinear Transmission Processes: Materials, Theory, and Applications; (2003) https://doi.org/10.1117/12.453562
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

We report here the nonlinear absorption and optical power limiting properties of polyfluorenes induced by two-photon absorption (TPA). Measurements were performed in chloroform between 450 and 650 nm for nanosecond time duration pulses. The nonlinear absorption is attributed to a three-photon absorption process involving a first TPA step followed by an excited state absorption (ESA) process. The TPA cross-sections of small oligomers increases with the square of their lengths. This trend is rationalized in terms of excitonic coupling between monomers within the range of the effective length of the oligomer. The corresponding three-photon absorption coefficient α₃ presents at resonance high values for the longest oligomers (α₃ very much greater than 10000 cm³/GW² for N = 60 at a concentration of 200 g/L), leading to efficient optical power limiting in the whole visible range (the maximum transmitted energy is lower than 10 μJ for an input energy of up to 350 μJ in a F/5 optical geometry).

Citation Download Citation

Remi Anemian, Jean-Christophe Mulatier, Chantal Andraud, Yannick Morel, Olivier Stephan, and Patrice L. Baldeck "Two-photon-absorption-induced nonlinear absorption in fluorene oligomers", Proc. SPIE 4797, Multiphoton Absorption and Nonlinear Transmission Processes: Materials, Theory, and Applications, (14 February 2003); https://doi.org/10.1117/12.453562

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