TITLE

Influence of spot size on extreme ultraviolet efficiency of laser-produced Sn plasmas

AUTHOR(S)
Harilal, S. S.; Coons, R. W.; Hough, P.; Hassanein, A.
PUB. DATE
November 2009
SOURCE
Applied Physics Letters;11/30/2009, Vol. 95 Issue 22, p221501
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have investigated the spot size effects on the extreme ultraviolet conversion efficiency (CE) of CO2 laser-produced Sn plasmas. The estimated CE of the laser to 13.5 nm radiation, within a 2% bandwidth, using a 10.6 μm CO2 laser with various pulse widths (25–55 ns) showed a double hump structure during a target-lens scan, where the CE is nearly 25% lower at the best focal position. Density analysis of the CO2 laser-produced plasma showed steep density gradients at the best focal position, and a reduction in CE at the best focal position, which is explained by the lack of efficient coupling between the laser and the plasma.
ACCESSION #
45610565

 

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