@article{d6a6490d2ded4ec9ac331dc4e8184ffd,
title = "Intense water-window soft x-ray emission by spectral control using dual laser pulses",
abstract = "We demonstrate intense emission in the water-window soft x-ray spectral region by controlling the spectral behavior through changing the balance between emissivity and self-absorption in an expanding plasma. The number of photons obtained from a dual laser irradiated target with a 150-ps pre-pulse was maximized at 3.8 × 1014 photons/sr in λ = 2.34 − 4.38 nm at a pulse separation time of 7 − 10 ns. Enhancement of the number of photons is attributed to efficient coupling with the main laser pulse while maintaining a tiny source size.",
author = "Goki Arai and Hiroyuki Hara and Tadashi Hatano and Takeo Ejima and Weihua Jiang and Hayato Ohashi and Shinichi Namba and Atsushi Sunahara and Akira Sasaki and Masaharu Nishikino and Gerry O'Sullivan and Takeshi Higashiguchi",
note = "Funding Information: Japan Society for the Promotion of Science (JSPS) KAKENHI, Grant-in-Aid for SScientific Research (B) Grant No. JP15H03570, Grant-in-Aid for Young Sccientists (B) Grant No. JP15K17728, Grant-in-Aid for JSPS Research Fellow Grant No. 17J08957; JSPS Bilateral Joint Research Project “Project for Bio-Imaging and Sensing at Utsunomiya University” Cooperative Research Program of “Network Joint Research Center for Materials and Devices” (under contract subject “20183037”). The UCD group was supported by the Science Foundation Ireland International Co-operation Strategic Award 13/ISCA/2846. Funding Information: The authors are deeply indebted to Dr. Thanh-Hung Dinh [National Institutes for Quantum and Radiological Science and Technology (QST)], Mr. Yuhei Suzuki, Mr. Masato Kawasaki, Mr. Yoshiko Kondo, Mr. Yusuke Fujii, Mr. Yuichi Ono, Mr. Takuya Gisuji, and Mr. Toshiki Tamura (Utsunomiya University) for useful technical support and discussion. Measurements of the grating efficiency and the response of the x-ray CCD camera were performed with the approval of the Photon Factory Program Advisory Committee (proposal No. 2015G667). Publisher Copyright: {\textcopyright} 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.",
year = "2018",
month = oct,
day = "15",
doi = "10.1364/OE.26.027748",
language = "English",
volume = "26",
pages = "27748--27756",
journal = "Optics Express",
issn = "1094-4087",
publisher = "The Optical Society",
number = "21",
}