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Nakai S, Nakatsuka M, Fujita H, Miyanaga N, Jitsuno T, Kanabe T, Izawa Y, Norimatsu T, Takagi M, Yamanaka T, Kato Y, Azechi H, Nishimura H, Shiraga H, Nakai M, Tanaka K, Kodama R, Takabe H, Nishihara K, Mima K, Kitagawa Y, Sakabe S, Yamanaka M, Kosaki Y, Yamanaka C, Sasaki T, Mori Y, Miyazaki K, Nishikawa M, Kan H, Hiruma T, Soman Y, Ito H, Perlado J, Alonso E, Munoz E, Sanz J. Laser Fusion Research at Ile Osaka University. ACTA ACUST UNITED AC 2018. [DOI: 10.13182/fst96-a11963008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- S. Nakai
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - M. Nakatsuka
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - H. Fujita
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - N. Miyanaga
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - T. Jitsuno
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - T. Kanabe
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - Y. Izawa
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - T. Norimatsu
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - M. Takagi
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - T. Yamanaka
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - Y. Kato
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - H. Azechi
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - H. Nishimura
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - H. Shiraga
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - M. Nakai
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - K.A. Tanaka
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - R. Kodama
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - H. Takabe
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - K. Nishihara
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - K. Mima
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - Y. Kitagawa
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - S. Sakabe
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - M. Yamanaka
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - Y. Kosaki
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - C. Yamanaka
- Institute of Laser Engineering, Osaka University 2-6 Yamada-oka, Suita, Osaka 565 Japan
| | - T. Sasaki
- Faculy of Engineering, Osaka University 2-1 Yamada-oka, Suita, Osaka 565 Japan
| | - Y. Mori
- Faculy of Engineering, Osaka University 2-1 Yamada-oka, Suita, Osaka 565 Japan
| | - K. Miyazaki
- Faculy of Engineering, Osaka University 2-1 Yamada-oka, Suita, Osaka 565 Japan
| | - M. Nishikawa
- Faculy of Engineering, Osaka University 2-1 Yamada-oka, Suita, Osaka 565 Japan
| | - H. Kan
- Hamamatsu Photonics K.K. 5000 Hirakuchi, Hamakita, Shizuoka 434 Japan
| | - T. Hiruma
- Hamamatsu Photonics K.K. 5000 Hirakuchi, Hamakita, Shizuoka 434 Japan
| | - Y. Soman
- Mitsubishi Heavy Industries. Ltd. 1-1-1 Wadasaki-cho, Hyogo-ku, Kobe 562 Japan
| | - H. Ito
- Kawasaki Heavy Industries. Ltd. 2-4-25 Minamisuna, Koto-ku, Tokyo 136 Japan
- Members of Laser Fusion Reactor Committee of Laser Society of Japan
| | - J.M. Perlado
- Instituto de Fusion Nuclear, Universidad Politecnica de Madrid 28006 Madrid Spain
| | - E. Alonso
- Instituto de Fusion Nuclear, Universidad Politecnica de Madrid 28006 Madrid Spain
| | - E. Munoz
- Instituto de Fusion Nuclear, Universidad Politecnica de Madrid 28006 Madrid Spain
| | - J. Sanz
- Instituto de Fusion Nuclear, Universidad Politecnica de Madrid 28006 Madrid Spain
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Uno K, Jitsuno T. Note: Simple 100 Hz N 2 laser with longitudinal discharge tube and high-voltage power supply using neon sign transformer. Rev Sci Instrum 2017; 88:126110. [PMID: 29289181 DOI: 10.1063/1.5009179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We developed a longitudinally excited N2 laser with a simple driver circuit and a simple power supply. The N2 laser consisted of a 20 cm-long glass tube with an inner diameter of 2.5 mm, a normal stable resonator formed by flat mirrors, a variable transformer, a neon sign transformer, a spark gap, and a 200 pF capacitance. The N2 laser produced a laser pulse with an energy of 379 nJ and a pulse width of 7.5 ns at a repetition rate of 100 Hz. The laser beam was circular and had a Gaussian profile with a correlation factor of 0.992 93.
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Affiliation(s)
- K Uno
- Graduate Faculty of Interdisciplinary Research Faculty of Engineering, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi 400-8511, Japan
| | - T Jitsuno
- Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
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3
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Nakatuska M, Azechi H, Jitsuno T, Kanabe T, Matsuoka S, Miyanaga M, Tada M, Nakai S. Glass Laser System, Gekko XII Upgrade for ICF Ignition. ACTA ACUST UNITED AC 2017. [DOI: 10.13182/fst94-a40244] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- M. Nakatuska
- Institute of Laser Engineering, Osaka University, Suita, Osaka, 565, Japan (06)879-8726
| | - H. Azechi
- Institute of Laser Engineering, Osaka University, Suita, Osaka, 565, Japan (06)879-8726
| | - T. Jitsuno
- Institute of Laser Engineering, Osaka University, Suita, Osaka, 565, Japan (06)879-8726
| | - T. Kanabe
- Institute of Laser Engineering, Osaka University, Suita, Osaka, 565, Japan (06)879-8726
| | - S. Matsuoka
- Institute of Laser Engineering, Osaka University, Suita, Osaka, 565, Japan (06)879-8726
| | - M. Miyanaga
- Institute of Laser Engineering, Osaka University, Suita, Osaka, 565, Japan (06)879-8726
| | - M. Tada
- Institute of Laser Engineering, Osaka University, Suita, Osaka, 565, Japan (06)879-8726
| | - S. Nakai
- Institute of Laser Engineering, Osaka University, Suita, Osaka, 565, Japan (06)879-8726
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4
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Uno K, Akitsu T, Jitsuno T. Short-pulse CO₂ laser with longitudinal tandem discharge tube. Rev Sci Instrum 2014; 85:103111. [PMID: 25362375 DOI: 10.1063/1.4898183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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 developed a longitudinally excited CO2 laser with a tandem discharge tube. The tandem scheme was constituted of two 30-cm long discharge tubes connected with an intermediate electrode. Two parts, each consisting of a charged capacitance and a 30-cm long discharge tube, were electrically connected in parallel and switched by a spark gap. The tandem scheme produced a short laser pulse like that of a TEA-CO2 laser with a charging voltage of -24.8 kV, which was smaller than the -40.0 kV charging voltage of our previous CO2 laser. At a gas pressure of 3.8 kPa, the spike pulse width was 145 ns, the pulse tail length was 58.8 μs, the output energy was 52.0 mJ, and the spike pulse energy was 2.4 mJ. We also investigated the dependence of the laser pulse and the discharge voltage on gas pressure.
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Affiliation(s)
- K Uno
- Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi 400-8511, Japan
| | - T Akitsu
- Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi 400-8511, Japan
| | - T Jitsuno
- Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
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Uno K, Akitsu T, Jitsuno T. Note: Longitudinally excited N₂ laser with low beam divergence. Rev Sci Instrum 2014; 85:096108. [PMID: 25273794 DOI: 10.1063/1.4894263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We developed a longitudinally excited N2 laser (337 nm) with low beam divergence without collimator lenses. The N2 laser consisted of a 30 cm long Pyrex glass tube with an inner diameter of 2.5 mm, a normal stable resonator formed by flat mirrors, and a simple, novel driver circuit. At a N2 gas pressure of 0.4 kPa and a repetition rate of 40 Hz, the N2 laser produced a circular beam with an output energy of 2.6 μJ and a low full-angle beam divergence of 0.29 mrad due to the uniform discharge formed by the longitudinal excitation scheme, the long cavity with the small aperture, and the low-input energy oscillation.
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Affiliation(s)
- K Uno
- Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi 400-8511, Japan
| | - T Akitsu
- Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi 400-8511, Japan
| | - T Jitsuno
- Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
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Shiraga H, Fujioka S, Nakai M, Watari T, Nakamura H, Arikawa Y, Hosoda H, Nagai T, Koga M, Kikuchi H, Ishii Y, Sogo T, Shigemori K, Nishimura H, Zhang Z, Tanabe M, Ohira S, Fujii Y, Namimoto T, Sakawa Y, Maegawa O, Ozaki T, Tanaka K, Habara H, Iwawaki T, Shimada K, Key M, Norreys P, Pasley J, Nagatomo H, Johzaki T, Sunahara A, Murakami M, Sakagami H, Taguchi T, Norimatsu T, Homma H, Fujimoto Y, Iwamoto A, Miyanaga N, Kawanaka J, Kanabe T, Jitsuno T, Nakata Y, Tsubakimoto K, Sueda K, Kodama R, Kondo K, Morio N, Matsuo S, Kawasaki T, Sawai K, Tsuji K, Murakami H, Sarukura N, Shimizu T, Mima K, Azechi H. Implosion and heating experiments of fast ignition targets by Gekko-XII and LFEX lasers. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20135901008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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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Sakawa Y, Nakamura H, Oshima S, Hatakeyama M, Kageiwa N, Hino S, Tanimoto S, Tanabe M, Habara H, Homma H, Norimatsu T, Jitsuno T, Cai H, Zhou W, Johzaki T, Sunahara A, Nagatomo H, Nishimura H, Tanaka KA, Mima K, Azechi H. A model experiment of a double-cone target using a gap target. ACTA ACUST UNITED AC 2010. [DOI: 10.1088/1742-6596/244/4/042012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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8
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Kawanaka J, Miyanaga N, Azechi H, Kanabe T, Jitsuno T, Kondo K, Fujimoto Y, Morio N, Matsuo S, Kawakami Y, Mizoguchi R, Tauchi K, Yano M, Kudo S, Ogura Y. 3.1-kJ chirped-pulse power amplification in the LFEX laser. ACTA ACUST UNITED AC 2008. [DOI: 10.1088/1742-6596/112/3/032006] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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9
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Miyanaga N, Azechi H, Tanaka KA, Kanabe T, Jitsuno T, Kawanaka J, Fujimoto Y, Kodama R, Shiraga H, Knodo K, Tsubakimoto K, Habara H, Lu J, Xu G, Morio N, Matsuo S, Miyaji E, Kawakami Y, Izawa Y, Mima K. 10-kJ PW laser for the FIREX-I program. ACTA ACUST UNITED AC 2006. [DOI: 10.1051/jp4:2006133016] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Jitsuno T, Tokumura K, Nakashima N, Nakatsuka M. Laser ablative shaping of plastic optical components for phase control. Appl Opt 1999; 38:3338-3342. [PMID: 18319931 DOI: 10.1364/ao.38.003338] [Citation(s) in RCA: 3] [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: 05/26/2023]
Abstract
A new scheme for phase control of optical components with laser ablation has been developed. One can ablate the surface shape of optical plastic material coated on a glass plate by using 193-nm laser light to control the transmission wave front. The surface shape is monitored in situ and corrected to attain the desired aberration level. The irradiation fluence is approximately 40 mJ/cm(2), and the ablation depth/pulse is approximately 0.01 microm/pulse for UV-cured resin. A wave-front aberration of 3.0 lambda is reduced to 0.17 lambda for flat surface shaping. For spherical surface generation, an aberration of 2.5 lambda is reduced to 0.2 lambda. The increase in surface roughness is kept within acceptable levels.
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Affiliation(s)
- T Jitsuno
- Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan.
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11
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Yoon GY, Matsuoka S, Jitsuno T, Nakatsuka M, Kato Y. Wave-front design algorithm for shaping a quasi-far-field pattern. Appl Opt 1998; 37:1386-1392. [PMID: 18268726 DOI: 10.1364/ao.37.001386] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
To design a fully continuous wave-front distribution suitable for focused beam shaping by a deformable mirror, we modify the phase-retrieval algorithm by employing a uniformly distributed phase as a starting phase screen and spatial filtering for the near-field phase retrieved during the iteration process. A special phase unwrapping algorithm is not required to obtain a continuous phase distribution from the retrieved phase since the boundary of the 2pi-phase-jumped region in the designed phase distribution is perfectly closed. From the computational result producing a uniform square beam transformation from a circular defocused beam, this algorithm has provided a fully continuous wave-front distribution with a lower spatial frequency for a deformable mirror. The transformed square beam has a normalized intensity nonuniformity of varsigma(rms) = 0.14 with respect to a desired flat-topped square beam pattern. This beam-shaping method also provides a high energy-concentration rate of more than 98%.
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12
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Yoon GY, Jitsuno T, Kato Y, Nakatsuka M. High-aspect-ratio line focus for an x-ray laser by a deformable mirror. Appl Opt 1997; 36:847-852. [PMID: 18250748 DOI: 10.1364/ao.36.000847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
A high-aspect-ratio line focus is required on a plane target in x-ray laser experiments for obtaining a high gain-length product. Inherent wave-front aberrations in line-focusing optics, which consist of a cylindrical lens and a spherical lens, are discussed with respect to beam diameter. The nonuniformity of the linewidth that is due to the aberrations is also calculated by the ABCD matrix method. A deformable mirror of a continuous plate type with a diameter of 185 mm provides an adequate wave-front distribution for compensating for the wave-front aberration. The wave-front control by the deformable mirror realizes a fine linewidth of 25 microm and 18.2 mm long, corresponding to the aspect ratio of 728. The linewidth is three times the diffraction limit. The intensity distribution along the line focus is also improved.
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Affiliation(s)
- G Y Yoon
- Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565, Japan
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13
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Yoon GY, Jitsuno T, Nakatsuka M, Nakai S. Shack Hartmann wave-front measurement with a large F-number plastic microlens array. Appl Opt 1996; 35:188-192. [PMID: 21068997 DOI: 10.1364/ao.35.000188] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A new plastic microlens array, consisting of 900 lenslets, has been developed for the Shack Hartmann wave-front sensor.The individual lens is 300 µm × 300µm and has a focal length of 10 mm, which provides the same focal size, 60 µm in diameter, with a constant peak intensity. One can improve thewave-front measurement accuracy by reducing the spot centroiding error by averaging a few frame memories of an image processor. A deformable mirror for testing the wave-front sensor gives anappropriate defocus and astigmatism, and the laser wave front is measured with a Shack Hartmann wave-front sensor. The measurement accuracy and reproducibility of our wave-front sensor are better than λ/20 and λ/50 (λ = 632.8 nm),respectively, in rms.
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14
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Sigel R, Tsakiris GD, Lavarenne F, Massen J, Fedosejevs R, Eidmann K, Meyer-ter-Vehn J, Murakami M, Witkowski S, Nishimura H, Kato Y, Takabe H, Endo T, Kondo K, Shiraga H, Sakabe S, Jitsuno T, Takagi M, Nakai S, Yamanaka C. Experimental investigation of radiation heat waves driven by laser-induced Planck radiation. Phys Rev A 1992; 45:3987-3996. [PMID: 9907449 DOI: 10.1103/physreva.45.3987] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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15
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Nishimura H, Kato Y, Takabe H, Endo T, Kondo K, Shiraga H, Sakabe S, Jitsuno T, Takagi M, Yamanaka C, Nakai S, Sigel R, Tsakiris GD, Massen J, Murakami M, Lavarenne F, Fedosejevs R, Meyer-ter-Vehn J, Eidmann K, Witkowski S. X-ray confinement in a gold cavity heated by 351-nm laser light. Phys Rev A 1991; 44:8323-8333. [PMID: 9905987 DOI: 10.1103/physreva.44.8323] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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16
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Tsakiris GD, Massen J, Sigel R, Lavarenne F, Fedosejevs R, Meyer-ter-Vehn J, Eidmann K, Witkowski S, Nishimura H, Kato Y, Takabe H, Endo T, Kondo K, Shiraga H, Sakabe S, Jitsuno T, Takagi M, Yamanaka C, Nakai S. Radiation confinement in x-ray-heated cavities. Phys Rev A 1990; 42:6188-6191. [PMID: 9903901 DOI: 10.1103/physreva.42.6188] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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17
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Sigel R, Tsakiris GD, Lavarenne F, Massen J, Fedosejevs R, Meyer-ter-Vehn J, Murakami M, Eidmann K, Witkowski S, Nishimura H, Kato Y, Takabe H, Endo T, Kondo K, Shiraga H, Sakabe S, Jitsuno T, Takagi M, Yamanaka C, Nakai S. Experimental observation of laser-induced radiation heat waves. Phys Rev Lett 1990; 65:587-590. [PMID: 10042961 DOI: 10.1103/physrevlett.65.587] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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