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Ion emission characteristics from laser-produced plasmas with steep density gradients

Ion emission from laser-produced plasma with small focal spots (20 μm) has been investigated for s - and p -polarization of the Nd–YAG laser at I L = 6 * 10 13 W/cm 2 . The target has been Plexiglas (H g , C 5 , O 2 ) n , and the ion analysis has been charge, mass and velocity resolved for emission angles between 15° and 65°. It is found that additional resonance absorption mainly leads to an enhancement of the number of totally emitted ions which is essentially uniform for a large region of the velocity spectrum. The total increase in plasma expansion energy is by a factor of more than 3·5. The relatively low enhancement of the average initial temperature produces an unexpected asymptotic charge distribution with higher charges if resonance absorption is not present.