7 October 1996 Degenerate four-wave mixing of nonether polyphenylquinoxaline solution
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Using picosecond laser operated at 532 nm, the observed time-resolved degenerate-four-wave-mixing (DFWM) spectra of nonether polyphenylquinoxaline (PPQ) solution show significant change in optical nonlinearity with changing solvents. For PPQ in cresol the DFWM spectrum obtained is composed of an instantaneous coherent optical response signal associated with the third-order susceptibility and a rapidly damped, laser-induced acoustic phonon signal. The lifetime of the generated acoustic phonon was estimated to be 1.5 ns. For PPQ in chloroform, an anomalously enhanced phonon signal overwhelms the intense coherent component. The generated acoustic phonon in PPQ-chloroform is much longer- lived. The mechanism of the observed optical response is discussed and the (chi) 3 value is calculated through resolving the coherent peak from the intense phonon signal.
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Huimin Liu, Huimin Liu, Yanyun Wang, Yanyun Wang, Weiyi Jia, Weiyi Jia, Meng Shen, Meng Shen, Shoukuan Fu, Shoukuan Fu, "Degenerate four-wave mixing of nonether polyphenylquinoxaline solution", Proc. SPIE 2853, Nonlinear Optical Liquids, (7 October 1996); doi: 10.1117/12.253480; https://doi.org/10.1117/12.253480

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