Influence of spot size on propagation dynamics of laser-produced tin plasma

Abstract

The plume dynamics in the presence of an ambient gas is very intriguing physics. The expansion of a laser-produced plasma in the presence of an ambient gas leads to internal plume structures, plume splitting, sharpening, confinement, etc. We investigated propagation dynamics of an expanding tin plume for various spot sizes using a fast visible plume imaging and Faraday cup diagnostic tools. Our results indicate that the sharpening of the plume depends strongly on the spot size. With a smaller spot size, the lateral expansion is found to be higher and the plume expansion is spherical while with a larger spot size the plume expansion is more cylindrical. Analysis of time resolved imaging also showed internal structures inside the plume.

Emission features and expansion dynamics of nanosecond laser ablation plumes at different ambient pressures

“…Compared to vacuum, the interaction of LPP with a background gas becomes complicated because of involvement of new processes, such as reduction in ablation, formation of shock waves and clustering, plume splitting and sharpening, deceleration and confinement of ablated species, thermalization of the ablated species, diffusion, etc. [19][20][21][22][23][24][25] Background pressure levels also play an important role on the morphology of the laser irradiated region and evolution of LPP. 8 In nanosecond laser ablation, plasma shielding is one of the most important factors that control the ablation as well as the emission, and the nature and pressure of ambient gas have a definite role in controlling the shielding effect.…”

Influence of laser beam intensity profile on propagation dynamics of laser-blow-off plasma plume

“…It can play a crucial role in the development of extreme ultraviolet lithography source, thin film deposition, synthesis of nanoparticles, metallic atomic beam source for accelerators, and probing neutral atomic beam in plasma environment (Chrisey & Hubler, 1994;Geohegan et al, 1998;Doria et al, 2004;Fazio et al, 2009;Hoffman, 2009;Huber et al, 2005;Masnavi et al, 2006;Nardi et al, 2009;Sizyuk et al, 2007;Wolowski et al, 2007;Wang et al, 2007). Several attempts have been made to optimize the expanding laser produced plasma plume by varying experimental factors like, ambient gas, focal spot size, laser pulse width, irradiance, and wavelength of ablating laser (Key et al, 1983;Bulgakova et al, 2000;Amoruso et al, 2003;Harilal, 2007;Beilis, 2007;Laska et al, 2008;Rafique et al, 2008). General observation is that the lateral velocity of the plume species increases with the increase in the laser fluence.…”

High-space resolution imaging plate analysis of extreme ultraviolet (EUV) light from tin laser-produced plasmas

“…The laser pulse length determined the laser intensity, and affected the size and shape of the resulting plasma. 29,30 The BAS-SR IP was chosen because of the protective mylar film on the surface of the plate. The mylar film performed as a filter for other radiation species produced on ablation of the tin target.…”