Abstract: The dispersion of cubic optical susceptibility of submicron films of pseudoisocianine J aggregates are measured by a z- scan technique. The values of Im$chi$+(3)$/, Re$chi$+(3)$/ near to J-peak were approximately 10$+$MIN@5$/ esu. The measurements have shown that the films near to J-peak have negative sign of Im$chi$+(3)$/(approximately ega@), which corresponds to nonlinear bleaching of absorption. The maximum $VBAR@Im$chi$+(3)$/(approximately ega@)$VBAR is observed for approximately ega approximately equals approximately ega$-J$/. It is found that at low frequency side of J-peak the sign of Im$chi$+(3)$/(approximately ega@) changes on positive. The measured dependence Re$chi$+(3)$/(approximately ega@) has compared with the value calculated by Kramers-Kronig transformation. For optical dense samples the contribution of a thermal nonlinearity is displayed. The spectral behavior features of Re$chi$+(3)$/(approximately ega@) and Im$chi$+(3)$/(approximately ega@) are explained by four-level model of Frenkel exciton. !17
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机译：摘要：通过z扫描技术测量了伪异辛胺J聚集体的亚微米薄膜的立方光敏度色散。接近J峰值的Im $ chi $ +（3）$ /，Re $ chi $ +（3）$ /的值约为10 $ + $ MIN @ 5 $ / esu。测量结果表明，靠近J峰的薄膜的负符号为Im $ chi $ +（3）$ /（大约ega @），这与吸收的非线性漂白相对应。观察到最大ega大约等于ega $ -J $ /时，最大$ VBAR @ Im $ chi $ +（3）$ /（大约ega @）$ VBAR。发现在J峰的低频侧，Im $ chi $ +（3）$ /（大约ega @）的符号发生正向变化。将测得的依赖性Re $ chi $ +（3）$ /（大约ega @）与通过Kramers-Kronig变换计算的值进行比较。对于高密度样品，显示了热非线性的贡献。 Re $ chi $ +（3）$ /（大约ega @）和Im $ chi $ +（3）$ /（大约ega @）的光谱行为特征由Frenkel激子的四级模型解释。 ！17
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