高密度セシウムレーザプラズマの研究

Abstract

A dense Cs vapour is irradiated by a tunable dye laser with the maximum power of 500KW and the half width of 20ns, and ionization mechanisms of the laser induced Cs plasma are investigated. An initial electron is produced by laser absorptions of the Cs molecular. At the high Cs number density, enough number of the Cs (6P) atoms are excited by electron collisions. If the dye laser is tuned to the atomic transition of 6P-9S, the Cs (6P) excited atom absorbs the further laser photon and is ionized. At the low Cs density, two-photon inoization is a main ionization process.