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Persistent URL http://purl.org/net/epubs/work/36991
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Record Id 36991
Title Efficient K-alpha and He-alpha emission from Ti foils irradiated with 400 nm, 45 fs laser pulses
Abstract We have used the ASTRA laser facility to irradiate Ti foils with 45-fs 400 nm laser pulses at irradiances Up to similar to 10(19) W cm(-2). We have observed both thermal line radiation, in the form of the He-like 1s(2)-1s2p transitions (He-alpha), and the K-alpha emission line. We have noted that the efficiency of K-alpha production is in excess of 2 x 10(-4) and thus compares well with using the fundamental 800 nm radiation. The behaviour of the K-alpha emission as a function of polarisation and angle of incidence suggests a vacuum heating mechanism as the principal source of the fast electrons necessary to create the inner-shell vacancies. Use of streak cameras in the X-ray regime has demonstrated that the emission of both K-alpha and He-alpha radiation lasts several picoseconds. In the former case, this would seem to imply that fast electrons generated by resonance absorption are circulated for some time before penetrating the foil. (C) 2005 Elsevier Ltd. All rights reserved.
Organisation CCLRC , CLF , CLF-HPL , CLF-ASTRA
Keywords CLF 2006-2007
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Language English (EN)
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Journal Article J Quant Spectrosc Rad 99, no. 1-3 (2006): 537-547. doi:10.1016/j.jqsrt.2005.05.043 2006