一种新型有机金属化合物的三阶光学非线性研究

为了研究一种新型有机金属化合物(十六烷基三甲基铵)双(1,3-二硫杂环戊烯-2-硫酮-4,5-二硫基)-镍(简称CTNi)的三阶非线性光学性质,配制了浓度为1.0×10-4mol/L的丙酮溶液作为待测样品,采用Z扫描测试技术,在波长为1064 nm,脉宽为40 ps的条件下研究了该样品的三阶非线性光学性质.研究发现,该材料具有很强的饱和吸收特性,其激发态有效吸收截面为eσff=1.47×10-18cm2,相应的非线性吸收系数β=-4.36×10-12m/W.另外,Z扫描曲线显示该材料还具有较强的自散焦效应,其三阶非线性折射系数n2=-1.55×10-18m2/W.

Study on Third-Order Optical Nonlinearities of a Novel Organo-Metallic Compound

In order to investigate the third-order optical nonlinearities of a novel type of organo-metallic compound, ［C16H33(CH3)3N］Ni(dmit)2 (dmit2-=4,5-dithiolate-1,3-dithiole-2-thione), abbreviated as CTNi, a sample solution with concentration 1.0×10-4 mol/L in acetone was prepared and its third-order optical nonlinearity was investigated using Z-scan technique at 1064 nm with 40 ps laser duration. Strong saturable absorption was found, the excited states effective absorption cross section was σeff=1.47×10-18 cm2, and the corresponding nonlinear absorption coefficient was β=-4.36×10-12 m/W. In addition, Z-scan curves revealed a self-defocusing effect with a large negative nonlinear refraction coefficient n2=-1.55×10-18 m2/W.