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Proceedings Paper

Ultrafast broadband reverse saturable absorption based on two-photon induced singlet state
Author(s): Xingzhi Wu; Jinchong Xiao; Yanbing Han; Guanghong Ao; Junyi Yang; Guang Shi; Yuxiao Wang; Xueru Zhang; Yinglin Song
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Paper Abstract

The broadband reverse absorption in a multi-branched conjugated compound TPPh is investigated. Transient absorptive spectra of TPPh solution is recorded and a broadband excited-state absorption (475~780 nm) is discovered. The lifetime of this broadband excited-state absorption was measured to be about 20 ns. Transient fluorescence experiment was conducted to confirm that the long-lived broadband excited-state absorption is established on the first singlet state. Optical limiting with extremely high linear transmittance is achieved under the excitation of 532 nm, 21 ps pulses. Theoretically analysis showed that both two-photon absorption and excited-state absorption played a part in it, optical limiting capability is thus enhanced via cooperating effects of two-photon absorption and excited-state absorption. All of the findings suggested that TPPh is a good broadband nonlinear absorptive material and could be further optimized for optical limiting applications.

Paper Details

Date Published: 24 October 2017
PDF: 7 pages
Proc. SPIE 10457, AOPC 2017: Laser Components, Systems, and Applications, 104570O (24 October 2017); doi: 10.1117/12.2283029
Show Author Affiliations
Xingzhi Wu, Harbin Institute of Technology (China)
Jinchong Xiao, Hebei Univ. (China)
Yanbing Han, Harbin Institute of Technology (China)
Guanghong Ao, Harbin Univ. of Science and Technology (China)
Junyi Yang, Soochow Univ. (China)
Guang Shi, Harbin Institute of Technology (China)
Yuxiao Wang, Harbin Institute of Technology (China)
Xueru Zhang, Harbin Institute of Technology (China)
Yinglin Song, Harbin Institute of Technology (China)

Published in SPIE Proceedings Vol. 10457:
AOPC 2017: Laser Components, Systems, and Applications
Shibin Jiang; Lijun Wang; Lan Jiang; Long Zhang, Editor(s)

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