2 February 2009 Z-scan determination of third-order nonlinear optical properties of Poly(4,4'-diazobenzene-2,5-thiophene)
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A novel material,Poly(4,4'-diazobenzene-2,5-thiophene) (PDABTh) was synthesized and its third-order optical nonlinearity was studied using Z-scan technique with 20 ps laser pulse at 1064 nm. We measured the nonlinear refractive index n2=8.4x10-19 m2/w with positive sign and nonlinear absorption coefficient β=1.8x10-12 m/w with reverse saturable absorption. The molecular second-order hyperpolarizability was calculated to be 4.2x10-30 esu. The special Π-electron structure may contribute to these relatively large non-linear optical properties. This suggests that the PDABTh may have a potential application in nonlinear optical devices.
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Huawei Shao, Mei Xiang, Zhenhong Jia, Xiaoyi Lü, "Z-scan determination of third-order nonlinear optical properties of Poly(4,4'-diazobenzene-2,5-thiophene)", Proc. SPIE 7160, 2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications, 716030 (2 February 2009); doi: 10.1117/12.810995; https://doi.org/10.1117/12.810995

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