中心金属原子对萘酞菁化合物激发态的光学非线性增强效应

Central metal ion enhances the excited state optical nonlinearity

of naphthalocyanine compound

Chang Qing,Chang Cun,Kong Degui,Gao Yachen,Gao Meiling

(College of Electronic Engineering,Heilongjiang University,Harbin 150080,China)

Abstract:The third -order optical nonlinearities of lead and palladium naphthalocyanine compounds were studied comparatively using Z -scan technique with ns laser pulses at 532nm.The experimental results showed that the two kinds of naphthalocyanine compounds also indicated strong nonlinear absorption (reserve saturable absorption)and nonlinear refraction (self -focusing)characteristics.Nonlinear absorption coefficient for lead and palladium naphthalocyanine compounds by theroetical fitting were 6.54?10-10m/W

and 3.90?10-10m/W,reprectively.Nonlinear refractive index coefficient n 2were 1.68?10-10esu and

8.04?10-11esu,reprectively.The second -order molecular hyperpolarizabilities

were 3.44?10-28esu and 2.57?10-28esu,reprectively,which were approximately about 105order in magnitude than that of CS 2(4.32?10-33esu).The experimental results show that the lead naphthalocyanine compound exhibits great optical nonlinearities than palladium naphthalocyanine compound results from the heavy metal atoms as central atom of naphthalocyanine lead compounds enhance the optical nonlinearities of naphthalocyanine compounds.

Key words:third -order optical nonlinearity;

naphthalocyanine;heavy atom effect CLC number:O437Document code:A Article ID:1007-2276(2015)02-0466-05

中心金属原子对萘酞菁化合物激发态的光学非线性增强效应

常青，常存，孔德贵，高亚臣，

高美玲(黑龙江大学电子工程学院，黑龙江哈尔滨150080)

摘要：应用Z-扫描技术对比研究了萘酞菁铅和萘酞菁钯化合物在波长为532nm 纳秒激光脉冲作

用下的三阶非线光学特性。实验结果表明，两种萘酞菁化合物均显现出较强的非线性吸收特性(反饱和吸收)和非线性折射特性(自聚焦)。理论拟合得出萘酞菁铅和萘酞菁钯的非线性吸收系数

分别为6.54?10-10m/W 和3.90?10-10m/W ；非线性折射系数率n 2分别为1.68?10-10esu 和8.04?10-11esu ；二阶分子超极化率系数γ分别为3.44?10-28esu 和2.57?10-28esu ，CS 2二阶分子超极化率系数为4.32?

10-33esu ；两种萘酞菁化合物的二阶分子超极化率强于CS 2近5个数量级。实验结果表明，

萘酞菁铅化合物具有较强的非线性吸收和非线性折射特性，且大于萘酞菁钯化合物的光学非线性特性是由于萘酞菁铅化合物的重原子效应提高了其光学非线性特性。

关键词：三阶光学非线性；萘酞菁；重原子效应

收稿日期：2014-06-16；修订日期：2014-07-20

基金项目：国家自然科学基金(51372072)；黑龙江省省高校科研创新团队支持计划(2012TD007)；

黑龙江大学创新团队支持计划(Hdtd2010-15)；黑龙江大学研究生创新科研基金(YJSCX2012-030HLJU)

作者简介：常青(1970-),女,教授,博士,主要从事功能材料与光学非线性方面的研究三Email:changqinghit@https://www.sodocs.net/doc/208396004.html, 第44卷第2期

红外与激光工程2015年2月

Infrared and Laser Engineering