TITLE

Effects of a prepulse on laser-induced EUV radiation conversion efficiency

AUTHOR(S)
Düsterer, S.; Schwoerer, H.; Ziegler, W.; Salzmann, D.; Sauerbrey, R.
PUB. DATE
January 2003
SOURCE
Applied Physics B: Lasers & Optics;2003, Vol. 76 Issue 1, p17
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The influence of prepulses on the conversion efficiency (CE) of laser radiation into 13 nm extreme ultraviolet (EUV) radiation, resulting from lithium-like oxygen ions from Ø20 µm water droplets, was investigated. The laser pulse durations in the experiment ranged from 200 fs to 120 ps. Applying prepulses preceding the main pulse at various delays of up to 11 ns, it was shown that the CE increases differently for each measured pulse duration. The strongest dependence on the introduction of a prepulse was observed for 2 ps laser pulses with a 20 mJ laser pulse energy. The EUV CE was improved by a factor of 15 by the introduction of a prepulse. Calculations on the atomic physics of oxygen ions and simulations of the laserplasma interaction revealed the influence of the prepulse on the EUV yield.
ACCESSION #
9133064

 

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