TY - JOUR KW - Ablation KW - Laser ablation KW - Plasma KW - Silicon KW - Bremsstrahlung KW - Critical temperature KW - Electron density KW - Electron temperature KW - Elemental semiconductors KW - Laser radiation AU - Haichen Liu AU - Xianglei Mao AU - Jong-Hyun Yoo AU - Richard E Russo AB -

A dramatic change in plasma characteristics, as well as a significant increase in the quantity of ablated mass were observed at a laser power density threshold of 20 GW/cm2. The electron number density and temperature of the laser-induced plasma show dramatic changes in their nonlinear behavior in the range of 2-80 GW/cm2. The crater volume undergoes some type of phase explosion at the threshold. Mechanisms such as inverse bremsstrahlung and self-regulation were used to describe the behavior below threshold. Self-focusing and critical temperature are discussed to explain the dramatic changes at the threshold.

AD -

Lawrence Berkeley Lab, Berkeley, CA 94720 USA

BT - Applied Physics Letters C2 - LBNL-44076 DO - 10.1063/1.124646 IS - 9 LA - eng LB - Laser N2 -

A dramatic change in plasma characteristics, as well as a significant increase in the quantity of ablated mass were observed at a laser power density threshold of 20 GW/cm2. The electron number density and temperature of the laser-induced plasma show dramatic changes in their nonlinear behavior in the range of 2-80 GW/cm2. The crater volume undergoes some type of phase explosion at the threshold. Mechanisms such as inverse bremsstrahlung and self-regulation were used to describe the behavior below threshold. Self-focusing and critical temperature are discussed to explain the dramatic changes at the threshold.

PY - 1999 SP - 1216 EP - 1218 ST - Appl. Phys. Lett. T2 - Applied Physics Letters TI - Nonlinear changes in plasma and crater properties during laser ablation of Si VL - 75 SN - 0003-6951 (print), 1077-3118 (online) ER -