TY - JOUR KW - Model KW - Target KW - Gas KW - Measurements KW - Measurement KW - USA KW - Surface KW - Emission KW - Pulse KW - Simulation KW - Experimental KW - Ablation KW - Laser KW - Laser ablation KW - Laser ablation KW - Breakdown KW - Field KW - Time KW - Ca KW - E KW - Form KW - Plasma KW - Solids KW - C KW - Metals KW - Development KW - Ga KW - Picosecond KW - Picosecond laser KW - Picosecond laser ablation KW - Density KW - Electron KW - Order KW - Ha KW - Dynamics KW - Results KW - Electron density KW - Physics KW - Plasma formation KW - Electron-density KW - Electron emission KW - Electron-emission KW - Forms KW - Heat transfer KW - Theoretical-model KW - Ablation plasma KW - Boundaries KW - Boundary KW - Electric-field KW - Electrons KW - Evolution KW - Movement KW - Origin KW - Suppression AU - Samuel S Mao AU - Xianglei Mao AU - Ralph Greif AU - Richard E Russo AB -

A theoretical model has been developed to simulate plasma formation and evolution during the early stage of picosecond laser ablation of solids. Surface electron emission was implemented as one boundary condition for plasma development above the target. The simulation results indicate that a plasma forms, with electron density on the order of 1020cm-3, during the picosecond laser pulse. Laser induced gas breakdown assisted by electron emission from the target was found to be the origin of the plasma. In agreement with experimental measurements, longitudinal movement of the electrons inside the plasma was suppressed after the laser pulse. The suppression of the plasma can be attributed to the development of a strong electric field above the target.

AD -

Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

BT - Applied Physics Letters C2 - LBNL-45578 DA - 06/2000 DO - 10.1063/1.126651 IS - 23 LA - eng LB - Laser N2 -

A theoretical model has been developed to simulate plasma formation and evolution during the early stage of picosecond laser ablation of solids. Surface electron emission was implemented as one boundary condition for plasma development above the target. The simulation results indicate that a plasma forms, with electron density on the order of 1020cm-3, during the picosecond laser pulse. Laser induced gas breakdown assisted by electron emission from the target was found to be the origin of the plasma. In agreement with experimental measurements, longitudinal movement of the electrons inside the plasma was suppressed after the laser pulse. The suppression of the plasma can be attributed to the development of a strong electric field above the target.

PY - 2000 SP - 3370 EP - 3372 ST - Appl. Phys. Lett. T2 - Applied Physics Letters TI - Simulation of a picosecond laser ablation plasma VL - 76 ER -