Energy deposition at front and rear surfaces during picosecond laser interaction with fused silica

Date Published
02/2001
Publication Type
Journal Article
Authors
DOI
10.1063/1.1362332
LBL Report Number
LBNL-51235
Abstract

The difference between front-surface and rear-surface energy deposition of a 35 ps laser pulse (λ=1064 nm) in fused silica was investigated using shadowgraphic and laser-deflection techniques. Shock waves were observed in the glass and in air. Shock waves generated in air at the front surface are stronger than at the rear surface. Less than 35% of the energy incident on the surface drives the air shock waves at the rear surface. Up to 90% of the incident energy drives the air shock waves at the front surface. Laser-plasma interaction is responsible for this difference and for limiting the amount of energy deposited inside the sample during front-surface ablation. Energy deposition at the rear surface is mostly limited by self-focusing inside the material.

Journal
Applied Physics Letters
Volume
78
Year of Publication
2001
Issue
19
Pagination
2840-2842
Keywords
Organizations
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