【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532 nm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β分别为6.54×10-10m/W和3.90×10-10 m/W;非线性折射系数率n2分别为1.68×10-10 esu和8.04×10-11 esu;二阶分子超极化率系数γ分别为3.44×10-28 esu和2.57×10-28 esu,CS2二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CS2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。更多还原

【Abstract】 The third-order optical nonlinearities of lead and palladium naphthalocyanine compounds were studied comparatively using Z-scan technique with ns laser pulses at 532 nm. 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 β for lead and palladium naphthalocyanine compounds by theroetical fitting were 6.54 ×10-10m/W and 3.90 ×10-10 m /W, reprectively. Nonlinear refractive index coefficient n2 were 1.68 ×10-10 esu and8.04 ×10-11 esu, reprectively. The second-order molecular hyperpolarizabilities γ were 3.44 ×10-28 esu and2.57 ×10-28 esu, reprectively, which were approximately about 105 order in magnitude than that of CS2(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.更多还原