液体中にYAG レーザで生成されたプラズマの物性に関する研究

Abstract

The plasma produced by focusing YAG laser beam in liquid is studied. Little is known about laser-produced plasma in liquid. Thus, the purpose of this study is to elucidate the physical properties of liquid plasma. The ultra pure water melted NaCl up until 24 % is used as a test liquid. This article describes about electron density and electron temperature of the laser produced liquid plasma. Dense plasma with the electron density of the order of 1025 m-3 is obtained by Mach-Zender interferometer. The electron density is highest at the focal spot, and decreases away from it. The several spectral lines are obtained by observing spectroscopicaly plasma luminescence ranging from 240 nm to 850 nm in step of 0.1 nm. The electron temperature is calculated from line intensity ratio of Oxygen atom. The electron temperature is obtained to be the order of 104 K. One of application of this study is to improve the quality of water by resolving environmental materials.