Nonlinear changes in plasma and crater properties during laser ablation of Si

Publication Type

Journal Article

LBNL Report Number

LBNL-44076

Abstract

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.

Journal

Applied Physics Letters

Volume

75

Year of Publication

1999

Short Title

Appl. Phys. Lett.

Issue

9
1216

Pagination

1216-1218

ISSN

0003-6951 (print), 1077-3118 (online)