CO2 laser-produced plasma ion component parameters were studied experimentally and numerically for aluminum and lead targets at peak laser intensity of 4 x 1013 W cm-2 and FWHM pulse duration of 15 ns. Angular dependences of ion number density, average velocity, and its spread were measured for different charge states by time-of-flight method. Ion charge state distribution shows high-charge and low-charge state groups. Ions in these groups have different average expansion velocity and longitudinal velocity spread. Angular distribution of high charge states is narrower than that of the low-charge state ion group, maximum yield of low charge states occurs at some angle from normal. For Al target the results show similar trends as for Pb target, but simulations have indicated that the effect of laser ponderomotive force is more pronounced in this case.
The measurement results are presented for angular dependency of the CO2 laser produced plasma parameters at power density of 4 by 1013W/cm2 and laser pulse duration of 14 ns. 2D numerical simulations are in sufficiently good agreement with experiment. It is shown that the light pressure effects on plasma expansion dynamics and the number of particles generated at the target normal direction.
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