16 January 2002 Multiple up-conversion emissions induced by three-photon absorption from two novel stibazolium-like dyes containing triple conjugated bridge
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Abstract
Strong three-photon absorption (3PA) and the frequency up- conversion fluorescence induced by 3PA in two novel stilbazolium-like dyes containing triple conjugated bridge have been observed, pumped with 35 ps laser at 1064 nm. The maximum fluorescence peaks are located in the 550, 610 and 700 nm respectively. The emission intensity dependence for the visible emissions on the 1064 nm excitation obeys the cubic law. A local emission (LE) of the donor moiety, excited intramolecular charge transfer state (ICT) and twisted intramolecular charge transfer state (TICT) are response for the multiple fluorescence emissions. The nonlinear transmitted intensity dependence on the laser incident intensity has been demonstrated as a main result referred to three-photon absorption in a 1-cm-path sample quartz cell with solute dissolved in dimethyl sulfoxide (DMSO) at 1064 nm, from which the calculated nonlinear absorption coefficient inferred from three-photon absorption fitted curve are (alpha) 3 equals 4.3 and 3.2 X 10-21 cm3/W2 and the corresponding molecular three-photon absorption cross sections are (sigma) 3 equals 1.9 and 1.6 X 10-76 cm6(DOT)s2, respectively. The optical limiting performances induced by 3 PA have been also performed and discussed for both dyes in DMSO.
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Duo-Yuan Wang, Duo-Yuan Wang, Chuan-Lang Zhan, Chuan-Lang Zhan, Yun-Jing Li, Yun-Jing Li, Zhen-Zhong Lu, Zhen-Zhong Lu, Yu-Xin Nie, Yu-Xin Nie, } "Multiple up-conversion emissions induced by three-photon absorption from two novel stibazolium-like dyes containing triple conjugated bridge", Proc. SPIE 4462, Nonlinear Optical Transmission Processes and Organic Photorefractive Materials, (16 January 2002); doi: 10.1117/12.452740; https://doi.org/10.1117/12.452740
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