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应用溶胶-凝胶技术,成功地把5,10,15,20-四(4-磺酸苯基)卟啉铜掺杂到SiO_2/TiO_2无机凝胶中,制备成有机-无机复合材料.采用开孔Z-扫描技术,使用波长532 nm、脉宽7ns的YAG脉冲激光为光源,测定了不同浓度卟啉铜掺杂的SiO_2/TiO_2凝胶Z-扫描曲线.应用Z扫描理论对获得的曲线进行分析与理论拟合,得到复合材料的非线性吸收系数.这些非线性吸收是由材料中卟啉铜的单聚体与二聚体的反饱和吸收所引起.研究表明,随着掺杂浓度的增大,复合材料的非线性吸收明显增强.掺杂浓度为1.11×10~(-4)(A2),1.48×10~(-4)(A3)与3.01×10~(-4)mol/L(A4)凝胶的非线性吸收系数分别为1.705×10~(-11),1.892×10~(-11)和4.854×10~(-11)m/W.讨论了单聚体与二聚体的浓度变化对非线性吸收的影响.随着掺杂浓度的增加,凝胶中二聚体与多聚体含量的增加,导致非线性吸收系数的增大.同时测定了无机材料对该光源的抗激光损伤阈值为～5.J/cm~2.
The sol-gel technique was used to successfully synthesize organic-inorganic composites by doping copper (5,10,15,20-tetrakis (4-sulfophenyl) porphyrin into SiO 2 / TiO 2 inorganic gel. The aperture Z-scan technique was used to measure the Z-scan curve of SiO_2 / TiO_2 gel doped with porphyrin copper doped with different concentrations of YAG pulsed laser with a wavelength of 532 nm and a pulse width of 7 ns. The Z-scan theory was used to analyze the obtained curve Analysis and theoretical fit to obtain the nonlinear absorption coefficient of the composite material.These nonlinear absorption is caused by the reverse saturable absorption of monopolymer and dimer of copper porphyrin in the material.The results show that with the doping concentration (A2), 1.48 × 10 ~ (-4) (A3) and 3.01 × 10 ~ (-4) mol / L (A4) gel were 1.705 × 10 ~ (-11), 1.892 × 10 ~ (-11) and 4.854 × 10 ~ (-11) m / Dimer concentration on the non-linear absorption.With the increase of doping concentration, the increase of dimer and multimer content in gel leads to the increase of nonlinear absorption coefficient.At the same time, The light source is resistant to laser damage Threshold ~ 5.J / cm ~ 2.