中文摘要：

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）。

英文摘要：

A novel soluble conjugated phenylacetylene copolymer containing nonlinear chromophore, poly {[4-ethynyl-4＇-（N,N- diethylamino）azobenzene]-co-phenylacetylen} was prepared and its optical limiting （OL） properties were investigated in three different concentration solution with 8ns pluses at 532nm wavelength. The excited state absorption cross-section σox of this polymer was measured with the Z-scan technique. The optical limiting mechanism was discussed based on nonlinear absorption theory. The results show that this polymer possesses the larger excited state absorption cross-section than the ground state, indicating that the OL performance of this polymer mainly arises from the reverse saturable absorption （RSA）.