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John C, Kishimoto M, Johzaki T, Higashiguchi T, Kakunaka N, Matsumoto Y, Hasegawa N, Nishikino M, Ejima T, Sunahara A, Endo T, Namba S. Enhancement of water-window soft x-ray emission from laser-produced Au plasma under low-pressure nitrogen atmosphere. Opt Lett 2019; 44:1439-1442. [PMID: 30874670 DOI: 10.1364/ol.44.001439] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Accepted: 02/21/2019] [Indexed: 06/09/2023]
Abstract
To generate bright water-window (WW) soft x rays (2.3-4.4 nm), gold slab targets were irradiated with laser pulses (1064 nm, 7 ns, 1 J). Emission spectroscopy showed that the introduction of low-pressure nitrogen enhanced the soft x-ray yield emitted from the laser-produced Au plasma. The intensity of the WW x-ray transported in a 400-Pa N2 atmosphere from the laser-produced plasma increased by 3.8 times over that in vacuum. Considering a strong x-ray absorption, the x-ray yield emitted directly from the Au plasma in the N2 gas was evaluated to be 13 times higher than that in vacuum. Although similar measurements were made for various gases, only N2 gas causes an increase in a soft x-ray yield. The processes leading to this enhancement mechanism were revealed by using hydrodynamic simulation and atomic structure codes.
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Arai G, Hara H, Hatano T, Ejima T, Jiang W, Ohashi H, Namba S, Sunahara A, Sasaki A, Nishikino M, O'Sullivan G, Higashiguchi T. Intense water-window soft x-ray emission by spectral control using dual laser pulses. Opt Express 2018; 26:27748-27756. [PMID: 30469835 DOI: 10.1364/oe.26.027748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Accepted: 08/07/2018] [Indexed: 06/09/2023]
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.
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Dinh TH, Suzuki Y, Hirose R, Hara H, Ohashi H, Li B, Dunne P, O'Sullivan G, Sunahara A, Higashiguchi T. Note: development of a volume-limited dot target for a high brightness extreme ultraviolet microplasma source. Rev Sci Instrum 2014; 85:116104. [PMID: 25430153 DOI: 10.1063/1.4901934] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report on production of volume-limited dot targets based on electron beam lithographic and sputtering technologies for use in efficient high brightness extreme ultraviolet microplasma sources. We successfully produced cylindrical tin (Sn) targets with diameters of 10, 15, and 20 μm and a height of 150 nm. The calculated spectrum around 13.5 nm was in good agreement with that obtained experimentally.
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Affiliation(s)
- Thanh Hung Dinh
- Department of Advanced Interdisciplinary Sciences and Center for Optical Research (CORE), Utsunomiya University, Yoto 7-1-2, Utsunomiya, Tochigi 321-8585, Japan
| | - Yuhei Suzuki
- Department of Advanced Interdisciplinary Sciences and Center for Optical Research (CORE), Utsunomiya University, Yoto 7-1-2, Utsunomiya, Tochigi 321-8585, Japan
| | - Ryoichi Hirose
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Hiroyuki Hara
- Department of Advanced Interdisciplinary Sciences and Center for Optical Research (CORE), Utsunomiya University, Yoto 7-1-2, Utsunomiya, Tochigi 321-8585, Japan
| | - Hayato Ohashi
- Graduate School of Science and Engineering for Research, University of Toyama, Toyama, Toyama 930-8555, Japan
| | - Bowen Li
- School of Physics, University College Dublin, Belfield, Dublin 4, Ireland
| | - Padraig Dunne
- School of Physics, University College Dublin, Belfield, Dublin 4, Ireland
| | - Gerry O'Sullivan
- School of Physics, University College Dublin, Belfield, Dublin 4, Ireland
| | - Atsushi Sunahara
- Institute for Laser Technology, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Takeshi Higashiguchi
- Department of Advanced Interdisciplinary Sciences and Center for Optical Research (CORE), Utsunomiya University, Yoto 7-1-2, Utsunomiya, Tochigi 321-8585, Japan
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Ohnishi N, Sunahara A. Development of laser ablation plasma by anisotropic self-radiation. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20135906005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Zhang Z, Nishimura H, Nishikino M, Sunahara A, Johzaki T, Cai H, Kawachi T, Pirozhkov A, Sagisaka A, Orimo S, Ogura K, Yogo A, Okano Y, Ohshima S, Fujioka S, Kiriyama H, Kondo K, Shimomura T, Kanazawa S. Efficient multi-keV X-ray generation from high-contrast laser plasma interaction. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20135918003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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