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Proceedings Paper

Optical power limiting properties of two-photon absorbing fluorene and dithienothiophene-based chromophores
Author(s): Kwang-Sup Lee; Hyun-Kwan Yang; Jong-Hyup Lee; Oh-Kil Kim; Han Young Woo; Heayoung Choi; Myoungsik Cha; Mireille H. Blanchard-Desce
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Paper Abstract

We have synthesized efficient two-photon absorbing fluorene and dithienothiophene (DTT) derivatives with electron donors (D) or electron acceptors (A) which are attached symmetrically or asymmetrically at the both end of conjugated links, forming D-π-D and D-π-A structures. The two-photon absorption (TPA) cross-section values (σ) of these chromophores were evaluated by the nonlinear transmission measurements using 8 ns laser pulse, and also by the two-photon-induced fluorescence method with 80 fs pulse laser. The σ values obtained were larger by the nanosecond pulse laser than that by the femtosecond laser. This result suggests that the relative contribution of the excited state absorption becomes more manifested when longer time scale pulses are used. The strong nonlinear absorption including TPA of all these materials induced an efficient optical power limiting (OPL) activity. The trend in OPL behavior agreed well with the size of the TPA intensity.

Paper Details

Date Published: 14 July 2003
PDF: 8 pages
Proc. SPIE 4991, Organic Photonic Materials and Devices V, (14 July 2003); doi: 10.1117/12.485829
Show Author Affiliations
Kwang-Sup Lee, Hannam Univ. (South Korea)
Hyun-Kwan Yang, Hannam Univ. (South Korea)
Jong-Hyup Lee, Hannam Univ. (South Korea)
Oh-Kil Kim, Naval Research Lab. (United States)
Han Young Woo, Naval Research Lab. (United States)
Heayoung Choi, Pusan National Univ. (South Korea)
Myoungsik Cha, Pusan National Univ. (South Korea)
Mireille H. Blanchard-Desce, Univ. de Rennes I and CNRS (France)

Published in SPIE Proceedings Vol. 4991:
Organic Photonic Materials and Devices V
James G. Grote; Toshikuni Kaino, Editor(s)

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