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Published Online: 10 November 2016
Accepted: October 2016

Soft X-ray emission from molybdenum plasmas generated by dual laser pulses

Appl. Phys. Lett. 109, 194103 (2016); https://doi.org/10.1063/1.4967310
Ragava Lokasani1,2, a), Goki Arai3, Yoshiki Kondo3, Hiroyuki Hara3, Thanh-Hung Dinh3,4, Takeo Ejima5, Tadashi Hatano5, Weihua Jiang6, Tetsuya Makimura7, Bowen Li8, Padraig Dunne2, Gerry O'Sullivan2, Takeshi Higashiguchi3,9, b), and Jiri Limpouch1
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ABSTRACT
We demonstrate efficient enhancement of soft X-ray (SXR) emission from molybdenum plasmas produced using dual pulse irradiation, in which 10-ns and 150-ps pre-pulses were followed by a 150-ps main pulse. The number of photons was observed to be 5.3 × 1016 photons/sr, which corresponded to a conversion efficiency of 1.5%/sr in λ = 2.34–4.38 nm region at a pulse separation time of 1 ns with the 150-ps pre-pulse. The conversion efficiency became 1.3 times as large as that produced by a single pulse. The results indicate the advantage of dual pulse irradiation using sub-ns pre-and main pulses to produce the bright plasmas required for applications such as laboratory based SXR microscopy.
This work was performed under the auspices of MEXT (Ministry of Education, Culture, Sports, Science and Technology, Japan) and “Project for Bio-Imaging and Sensing at Utsunomiya University” from MEXT and was performed under the Cooperative Research Program of “Network Joint Research Center for Materials and Devices” (under Contract subject “20163034”). Measurements of the grating efficiency and the response of the X-ray CCD camera were performed under the approval of the Photon Factory Program Advisory Committee (Proposal No. 2015G667). R.L. is supported by the award of a fellowship by the Education, Audio-visual and Culture Executive Agency (EACEA) Erasmus Mundus Joint Doctorate Program EXTATIC, Project No. 2012-0033. J.L. was supported by MEYS CR Project No. LG15013. The UCD group was supported by the Science Foundation Ireland International Co-operation Strategic Award No. 13/ISCA/2846.

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  1. Published by AIP Publishing.

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