飞秒laser照射下ZnO纳米粒子的三阶非线性研究
Third order nonlinear study of ZnO nano particles under femto-second laser illumination
摘要：
采用简易沉淀法合成了不同Ag掺杂量的ZnO纳米粒子。采用Z扫描技术，在重复频率为1 kHz、中心波长为532 nm、脉冲宽度为130飞秒的激光脉冲作用下，研究了ZnO纳米粒子的双光子吸收截面和非线性折射率。采用速率方程方法，通过理论计算得到了ZnO纳米粒子的2PA截面。吸收截面和非线性折射率都随着Ag掺杂量的增加而增加。我们已经观察到的非线性折射率的增加104的顺序在飞秒激光激发的存在下，参考纳秒激光激发。
英文摘要：
ZnO nano particles are synthesized at different percentages of Ag dopant by facile precipitation method. Two photon absorption (2PA) cross-section and nonlinear refractive index of ZnO nano particles are studied with 130 femto-second laser pulses at a repletion rate of 1 kHz with central wavelength of 532 nm by z-scan technique. The 2PA cross-section of ZnO nano particles are obtained by theoretical calculations, using rate equation approach. Both absorption cross-section and nonlinear refractive index increased with increasing the Ag dopant percentage. We have observed an increase of order of 104 in the nonlinear refractive index in the presence of femto-second laser excitation with reference to nano-second laser excitation.
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