Effects of Laser Pulse Width and Solvent on the Optical Nonlinearities of ZnO Nanoparticles
This work is supported by grant No. 51372072 of the Natural Science Fund of China, grant No. 2012TD007 of the Science and Technology Innovative Research Team in Higher Educational Institutions of Heilongjiang Province, grant No. Hdtd2010-15 of the High Level Team Project of Heilongjiang Province and University.
Based on the Z-scan technology, the nonlinear absorption characteristics, the nonlinear refraction characteristics of ZnO nanoparticles dimethylformamide (DMF) solution and ZnO nanoparticles ethanol solution have been studied under the nanosecond (ns) laser pulses and the picosecond (ps) laser pulses. The experimental results show that the third-order nonlinear effect of ZnO nanoparticles ethanol solution is stronger than that of ZnO nanoparticles DMF solution under the ns laser pulses, and the third-order nonlinear susceptibility coefficient of the ZnO nanoparticles DMF and the ethanol solution are |χ(3)| = 2.15 × 10−12 esu, |χ(3)| = 8.12 × 10−12 esu respectively. The third-order nonlinear effect of the ZnO nanoparticles ethanol solution is similar to the ZnO nanoparticles DMF solution under the ps laser pulses. The third-order nonlinear susceptibility coefficient of the ZnO nanoparticles DMF and the ethanol solution are |χ(3)| = 1.16 × 10−14 esu, |χ(3)| = 1.15 × 10−14 esu respectively and the optical nonlinearities of ZnO nanoparticles under the ns laser pulses are better than that of the ZnO nanoparticles under the ps laser pulses.
