Nanocylinder-array structure greatly increases the soft X-ray intensity generated from femtosecond-laser-produced plasma |
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| Authors: | T Nishikawa H Nakano K Oguri N Uesugi M Nakao K Nishio H Masuda |
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| Institution: | (1) NTT Basic Research Laboratories, 3-1 Morinosato Wakamiya, Atsugi-shi, Kanagawa 243-0198, Japan (Fax: +81-462/70-2361, E-mail: nisikawa@will.brl.ntt.co.jp), JP;(2) NTT Photonics Laboratories, 3-1 Morinosato Wakamiya, Atsugi-shi, Kanagawa 243-0198, Japan, JP;(3) Department of Applied Chemistry, Tokyo Metropolitan University, 1-1 Minamiosawa, Hachioji-shi, Tokyo 192-0397, Japan, JP |
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| Abstract: | In order to increase the soft X-ray conversion efficiency for the femtosecond-laser-produced plasma, we adopted a nanocylinder-array
structure target. Gold nanocylinder-array targets with 70–90 nm cylinder diameter and 100 nm cylinder pitch were made. A continuous
smooth soft X-ray spectrum adequate for X-ray absorption spectroscopy was obtained. An around 20-fold soft X-ray (7–20 nm)
fluence enhancement compared with a flat-surface gold foil target was obtained when the cylinder height was 18 μm. X-ray (>0.06 keV)
pulse duration was 17 ps, which is much shorter than that obtained by using the pre-pulse technique. The X-ray pulse peak
intensity was 7-fold higher than that of a gold foil target.
Received: 2 May 2001 / Revised version: 1 June 2001 / Published online: 18 July 2001 |
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| Keywords: | PACS: 52 50 Jm 52 38 Dx 52 38 Ph |
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