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制备了一个新型可溶的含非线性生色团的聚炔共聚物,在8ns脉宽532nm下研究了不同浓度溶液的光限幅性能。采用Z-扫描技术测试了聚合物的激发态吸收,基于非线性理论对光限幅机理进行了讨论。结果表明聚合物的激发态吸收截面大于其基态吸收截面,其光限幅性能主要来源于分子的反饱和吸收(RSA)。
A novel soluble poly (acetylene) copolymer with non-linear chromophore was prepared. The optical limiting properties of solutions with different concentrations were investigated at 8 ns pulse width of 532 nm. The absorption of the excited state of the polymer was tested by Z-scan technique. The optical limiting mechanism was discussed based on the nonlinear theory. The results show that the excited state absorption cross section of the polymer is larger than that of the ground state absorption cross section, and the light limiting property mainly comes from the molecule’s reverse saturation absorption (RSA).