Product Code: PIC2008_1201

Improving Physical Properties of Functional Materials by Laser Irradiation (Invited Paper)
Yijian Jiang, Institiute of Laser Engineering, Beijing University of Technology; Beijing Peoples Republic of China
Lingfei Ji, Beijing University of Technology ; Beijing Peoples Republic of China
Presented at PICALO 2008

In this presentation, progress on improving physical properties of functional materials by laser irradiation is reported and discussed. After laser irradiation, some physical properties, such as dielectric, electrical conductivity, piezoelectric, magnetic, transparency, and photoluminescence properties, can be found to be enhanced in some crystals, ceramics, or thin films. Sintered with a CO2 laser, a novel Ta2O5-based ceramics with maximum κ of 450 can be obtained at ambient conditions. The electrical conductivity of Poly(vinylidene fluoride) induced by excimer laser irradiation was found to increase from 10-13 Ω-1cm-1 to 10-4 Ω-1cm-1. Significant improvement in the magnetotransport properties of La0.67Ca0.33MnO3 thin film irradiated by CO2 laser in air can be obtained. Irradiated with a CO2 laser, the polarization and piezoelectric constants of some pizeoelectric ceramics was found to increase. Based upon the characterization, the phase, micro-structure, and the mechanism of property modification in laser irradiated samples were analyzed.

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