polyethylene or carbon target to produce plasma, and the laser energy is transferred to the expansion energy of plasma. After the ions and electrons included in the expansion plasma are separated electrostatically, only the ions are captured on the collector and current flows. The following three processes in the PDC are considered. 3.1 Laser Energy Absorption by Plasma The interaction phenomena of the laser light with the target plasma is different with the laser power density on the target when the laser energy is transferred to the expansion energy of plasma. In the case of the CO2 laser, the absorption mechanism is mainly the classical absorption (inversebremsstrahlung) at less than 1010 w/cm2. Nonlinear phenomena, such as parametric instability and resonance absorption, appear at higher than 1010 w/cm2, and the laser energy is absorbed abnormally by
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