Study on Physical Properties of Plasma Generated by YAG Laser in Liquid

抄録

The plasma generated by focusing Nd:YAG laser beam in liquid is studied to clarify the physical properties of liquid laser plasma. Little is known about laser-produced plasma in liquid. The ultra pure water dissolved NaCl up to 24 % is used as a test liquid. The electron density is measured by Mach-Zender interferometer. Dense plasma with electron density of the order of 10²⁵-10²⁶ m^-3 is observed. The electron density is highest at the focal spot while it decreases with distance from there. The several spectral lines in plasma luminescence are observed in the wavelength of 240 nm to 850 nm. The electron temperature is calculated from light intensity ratio of Hydrogen atom. The electron temperature is measured to be about 5000 K.