Emission and expansion features of ns and fs laser ablation plumes in an ambient environment

Author

Harilal, S.S. ; Farid, N. ; Miloshevsky, A. ; Diwakar, P.K. ; Hassanein, A.

Author_Institution

Center for Mater. Under eXtreme Environ., Purdue Univ., West Lafayette, IN, USA

fYear

2014

fDate

8-13 June 2014

Firstpage

1

Lastpage

2

Abstract

We investigated the emission and hydrodynamic expansion dynamics of ns and fs laser ablated metal plasmas in the presence of an ambient with pressures ranging from vacuum to atmospheric levels. The role of background pressure on spectral emission features, absolute line intensities, signal to background ratios, plume hydrodynamics, and ablation craters were studied. The structure and dynamics of both ns and fs plumes obtained from optical diagnostic tools were compared to continuum hydrodynamic model (CFD) results.

Keywords

laser ablation; plasma diagnostics; plasma flow; plasma light propagation; plasma production by laser; ablation craters; absolute line intensities; ambient environment; background pressure; background ratios; continuum hydrodynamic model; fs laser ablated metal plasma; hydrodynamic expansion dynamics; ns laser ablated metal plasma; optical diagnostic tools; plume hydrodynamics; spectral emission; Computational fluid dynamics; Hydrodynamics; Laser ablation; Laser modes; Laser theory; Plasmas;

fLanguage

English

Publisher

ieee

Conference_Titel

Lasers and Electro-Optics (CLEO), 2014 Conference on

Conference_Location

San Jose, CA

Type

conf

Filename

6989389