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Jin Z, Zhuo HB, Nakazawa T, Shin JH, Wakamatsu S, Yugami N, Hosokai T, Zou DB, Yu MY, Sheng ZM, Kodama R. Highly efficient terahertz radiation from a thin foil irradiated by a high-contrast laser pulse. Phys Rev E 2016; 94:033206. [PMID: 27739720 DOI: 10.1103/physreve.94.033206] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Indexed: 11/07/2022]
Abstract
Radially polarized intense terahertz (THz) radiation behind a thin foil irradiated by ultrahigh-contrast ultrashort relativistic laser pulse is recorded by a single-shot THz time-domain spectroscopy system. As the thickness of the target is reduced from 30 to 2 µm, the duration of the THz emission increases from 5 to over 20 ps and the radiation energy increases dramatically, reaching ∼10.5mJ per pulse, corresponding to a laser-to-THz radiation energy conversion efficiency of 1.7%. The efficient THz emission can be attributed to reflection (deceleration and acceleration) of the laser-driven hot electrons by the target-rear sheath electric field. The experimental results are consistent with that of a simple model as well as particle-in-cell simulation.
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Affiliation(s)
- Z Jin
- Photon Pioneers Center, Osaka University, 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan
| | - H B Zhuo
- College of Science, National University of Defense Technology, Changsha 410073, People's Republic of China.,Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
| | - T Nakazawa
- Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan
| | - J H Shin
- Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan
| | - S Wakamatsu
- Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan
| | - N Yugami
- Department of Advanced Interdisciplinary Sciences, Center for Optical Research & Education, and Optical Technology Innovation Center, Utsunomiya University, Yoto 7-1-2, Utsunomiya, Tochigi, 321-8585, Japan
| | - T Hosokai
- Photon Pioneers Center, Osaka University, 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan
| | - D B Zou
- College of Science, National University of Defense Technology, Changsha 410073, People's Republic of China
| | - M Y Yu
- Institute for Fusion Theory and Simulation and Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China and Institute of Theoretical Physics I, Ruhr University, D-44780 Bochum, Germany
| | - Z M Sheng
- Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.,SUPA, Department of Physics, University of Strathclyde, Glasgow G0 4NG, United Kingdom.,Key Laboratory for Laser Plasmas (Ministry of Education) and Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
| | - R Kodama
- Photon Pioneers Center, Osaka University, 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan.,Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan.,Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka, 565-0871, Japan
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Zhang TJ, Jin Z, Wakamatsu S, Hosokai T, Yugami N, Kodama R. Note: Single-shot time-domain spectroscopy and spatial profiling of terahertz pulses from intense laser systems. Rev Sci Instrum 2016; 87:066101. [PMID: 27370502 DOI: 10.1063/1.4953116] [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: 06/06/2023]
Abstract
Single-shot terahertz time-domain spectroscopy is presented with directly encoded spatial resolution. A single reflective echelon and multiple semi-cylindrical lenses are used to obtain both the temporal waveform and the spatial distribution of the terahertz field. This system can be used to rapidly characterize terahertz pulses generated by high power pulsed laser systems, which themselves suffer from large pulse energy and spectrum fluctuations.
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Affiliation(s)
- T J Zhang
- Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Z Jin
- Photon Pioneers Center, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - S Wakamatsu
- Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - T Hosokai
- Photon Pioneers Center, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - N Yugami
- Department of Advanced Interdisciplinary Sciences, Center for Optical Research & Education (CORE), and Optical Technology Innovation Center (OpTIC), Utsunomiya University, Yoto 7-1-2, Utsunomiya, Tochigi 321-8585, Japan
| | - R Kodama
- Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
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Jin Z, Wada A, Shin JH, Yugami N, Kodama R. A Single-shot Terahertz Time-domain Spectroscopy Instrument for Intense Laser System. ACTA ACUST UNITED AC 2016. [DOI: 10.1088/1742-6596/688/1/012040] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [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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Sakai S, Higashiguchi T, Yugami N, Bobrova N, Sentoku Y, Kodama R. Dynamics of the spectral behaviour of an ultrashort laser pulse in an argon-gas-filled capillary discharge-preformed plasma channel. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20135917002] [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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Yugami N, Suzuki F, Kashiwazaki H, Higashiguchi T, Sentoku Y, Nishida A, Kodama R. THz radiation from an ultrashort-laser-induced fast spark dense plasma. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20135918007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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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Nishida A, Nakata M, Oba T, Higashiguchi T, Yugami N, Sentoku Y, Kodama R. Frequency upshift via flash ionization phenomena using semiconductor plasma. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20135919004] [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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Nishida A, Kashiwazaki H, Yoshida S, Higashiguchi T, Yugami N, Kodama R. A tapered parallel plate waveguide for frequency up-conversion of terahertz radiation. Rev Sci Instrum 2012; 83:045104. [PMID: 22559573 DOI: 10.1063/1.3697700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A tapered parallel plate waveguide was developed for frequency up-conversion experiments in the terahertz (THz) region by flash ionization. The element at the plasma-source-wave interaction area determines the conversion efficiency. It causes THz pulses to converge to a narrow plate separation, which is smaller than the wavelength. The waveguide exhibited good performance for transmitting p-polarized THz pulses in a 50 μm separation, making it suitable for flash ionization experiments.
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Affiliation(s)
- A Nishida
- Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan.
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Ito H, Rajyaguru C, Yugami N, Nishida Y, Hosoya T. Propagation characteristics and guiding of a high-power microwave in plasma waveguide. Phys Rev E Stat Nonlin Soft Matter Phys 2004; 69:066406. [PMID: 15244744 DOI: 10.1103/physreve.69.066406] [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] [Received: 02/15/2004] [Indexed: 05/24/2023]
Abstract
The propagation characteristics of a high-power microwave [electromagnetic (em) wave] in a plasma waveguide are reported. The plasma waveguide is formed by expanding plasmas via the ponderomotive force of the high-power microwave and the microwave pulse remains trapped within the plasma waveguide and is guided in it. With the increase of the incident microwave power, the width of the plasma waveguide increases and the half width of the radial electric field distribution decreases. This shows that the em wave modifies the refractive index of the plasma waveguide area. For a plasma waveguide with narrower width, the microwave propagates along the plasma waveguide at the fundamental TE mode, while as the waveguide width increases the higher mode component starts appearing. Analytical treatment to the propagation of the electromagnetic wave in a dielectric waveguide having a step-index profile and the numerical calculations for the radial distribution of the electric field show fairly good agreement with the results observed in the present experiments.
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Affiliation(s)
- H Ito
- Energy and Environmental Science, Graduate School of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi 321-8585, Japan.
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Yugami N, Higashiguchi T, Gao H, Sakai S, Takahashi K, Ito H, Nishida Y, Katsouleas T. Experimental observation of radiation from cherenkov wakes in a magnetized plasma. Phys Rev Lett 2002; 89:065003. [PMID: 12190591 DOI: 10.1103/physrevlett.89.065003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2002] [Indexed: 05/23/2023]
Abstract
A proof-of-principle experiment demonstrates the generation of radiation from the Cherenkov wake excited by an ultrashort- and ultrahigh-power pulse laser in a perpendicularly magnetized plasma. The frequency of the radiation is in the millimeter range (up to 200 GHz). The intensity of the radiation is proportional to the magnetic field intensity as expected by theory. Polarization of the emitted radiation is also detected. The difference in the frequency of the emitted radiation between these experiments and previous theory can be explained by the electrons' oscillation in the electric field of a narrow column of ions in the focal region.
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Affiliation(s)
- N Yugami
- Department of Energy and Environmental Science, Graduate School of Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi 321-8585, Japan.
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Bakunov MI, Maslov AV, Novokovskaya AL, Yugami N, Nishida Y. Interaction of an electromagnetic wave with a suddenly stopped ionization front. Phys Rev E Stat Nonlin Soft Matter Phys 2002; 66:026404. [PMID: 12241294 DOI: 10.1103/physreve.66.026404] [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] [Received: 11/03/2001] [Revised: 03/19/2002] [Indexed: 05/23/2023]
Abstract
The theory of the interaction of an electromagnetic wave with a uniformly moving ionization front in a gas is extended to include the case when the front suddenly stops. This nonstationary character of the wave/front interaction, which is typical for experiments carried out in a finite-size gas tube, gives rise to fresh physical effects. First, currents induced near the plasma boundary after the front stops produce a static magnetic field not only in the plasma behind the front but also in the vacuum ahead of the front. Second, in the regime where the transmitted wave falls off behind the front, the skinning field leaks through the stopped front and produces a burst of highly frequency up-shifted radiation.
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Affiliation(s)
- M I Bakunov
- Department of Radiophysics, University of Nizhny Novgorod, Nizhny Novgorod 603950, Russia
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Andreev NE, Nishida Y, Yugami N. Propagation of short intense laser pulses in gas-filled capillaries. Phys Rev E Stat Nonlin Soft Matter Phys 2002; 65:056407. [PMID: 12059715 DOI: 10.1103/physreve.65.056407] [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] [Received: 10/22/2001] [Indexed: 05/23/2023]
Abstract
The guided laser pulse propagation and wake-field generation are studied in a wide (in comparison with the laser spot size) gas-filled capillary with an on-axis gas density depletion, which can be produced by a rapid spin of the capillary around its axis or by radially propagating shock waves generated in a piezoceramic tube. A single equation for the wake-field potential, which describes the fully relativistic plasma response in the presence of optical field ionization (OFI) of a gas, is derived and used to demonstrate a guided propagation of a short intense laser pulse over many Rayleigh lengths in a leaky plasma channel produced by the pulse due to OFI in the capillary filled with a radially inhomogeneous gas. The efficient generation of a regular wake field over long distances suitable for the laser wake-field accelerators is shown.
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Affiliation(s)
- N E Andreev
- Institute for High Energy Densities, Associated Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya 13/19, Moscow 127412, Russia.
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Rajyaguru C, Fuji T, Ito H, Yugami N, Nishida Y. Observation of ultrahigh-energy electrons by resonance absorption of high-power microwaves in a pulsed plasma. Phys Rev E Stat Nonlin Soft Matter Phys 2001; 64:016403. [PMID: 11461406 DOI: 10.1103/physreve.64.016403] [Citation(s) in RCA: 2] [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] [Received: 12/08/2000] [Indexed: 05/23/2023]
Abstract
The interaction of high power microwave with collisionless unmagnetized plasma is studied. Investigation on the generation of superthermal electrons near the critical layer, by the resonance absorption phenomenon, is extended to very high microwave power levels (eta=E(2)(0)/4 pi n(e)kT(e) approximately 0.3). Here E0, n(e), and T(e) are the vacuum electric field, electron density, and electron temperature, respectively. Successive generation of electron bunches having maximum energy of about 2 keV, due to nonlinear wave breaking, is observed. The electron energy epsilon scales as a function of the incident microwave power P, according to epsilon proportional to P0.5 up to 250 kW. The two-dimensional spatial distribution of high energy electrons reveals that they are generated near the critical layer. However, the lower energy component is again produced in the subcritical density region indicating the possibility of other electron heating mechanisms.
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Affiliation(s)
- C Rajyaguru
- Energy and Enviromental Science, Graduate School of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya Tochigi 321-8585, Japan
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Higashiguchi T, Yugami N, Gao H, Niiyama T, Sasaki S, Takahashi E, Ito H, Nishida Y. Experimental observation of further frequency upshift from dc to ac radiation converter with perpendicular dc magnetic field. Phys Rev Lett 2000; 85:4542-4545. [PMID: 11082591 DOI: 10.1103/physrevlett.85.4542] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2000] [Indexed: 05/23/2023]
Abstract
A frequency upshift of a short microwave pulse is generated by the interaction between a relativistic underdense ionization front and a periodic electrostatic field with a perpendicular dc magnetic field. When the dc magnetic field is applied, further frequency upshift of 3 GHz is observed with respect to an unmagnetized case which has typically a GHz range. The radiation frequency depends on both the plasma density and the strength of the dc magnetic field, i.e., the plasma frequency and the cyclotron frequency. The frequency of the emitted radiation is in reasonable agreement with the theoretical values.
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Affiliation(s)
- T Higashiguchi
- Department of Energy and Environmental Science, Graduate School of Engineering, Utsunomiya University, Utsunomiya, Tochigi 3218585, Japan
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Takahashi E, Honda H, Miura E, Yugami N, Nishida Y, Katsura K, Kondo K. Observation of spatial asymmetry of THz oscillating electron plasma wave in a laser wakefield. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 2000; 62:7247-7250. [PMID: 11102082 DOI: 10.1103/physreve.62.7247] [Citation(s) in RCA: 2] [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] [Received: 01/06/2000] [Revised: 04/18/2000] [Indexed: 05/23/2023]
Abstract
The asymmetric spatial distribution of electron density perturbation is observed by using a frequency-domain interferometry technique. The wake amplitude of the outside bump is enhanced by the elliptical distribution of the pump laser pulse. This asymmetry can be explained with a two-dimensional analytical model expanded from cylindrically symmetric linear theory.
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Affiliation(s)
- E Takahashi
- Center for Tsukuba Advanced Research Alliance, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan and Energy and Environmental Science, Graduate School of Engineering, Utsunomiya University, 7-1-2 Yoto Utsunomiya, Tochigi 321
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Ueki T, Nishida Y, Yugami N. Observation of controlled intermittent chaos in ion-beam-plasma instabilities. Phys Rev Lett 1996; 76:4171-4174. [PMID: 10061219 DOI: 10.1103/physrevlett.76.4171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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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Yugami N, Kikuta K, Nishida Y. Electron acceleration by a transverse electromagnetic wave supplemented with a crossed static magnetic field. Phys Rev Lett 1996; 76:1635-1638. [PMID: 10060479 DOI: 10.1103/physrevlett.76.1635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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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Nakajima K, Fisher D, Kawakubo T, Nakanishi H, Ogata A, Kato Y, Kitagawa Y, Kodama R, Mima K, Shiraga H, Suzuki K, Yamakawa K, Zhang T, Sakawa Y, Shoji T, Nishida Y, Yugami N, Downer M, Tajima T. Observation of ultrahigh gradient electron acceleration by a self-modulated intense short laser pulse. Phys Rev Lett 1995; 74:4428-4431. [PMID: 10058504 DOI: 10.1103/physrevlett.74.4428] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [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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Nakajima K, Kawakubo T, Nakanishi H, Ogata A, Kitagawa Y, Kodama R, Mima K, Shiraga H, Suzuki K, Yamakawa K, Zhang T, Kato Y, Fisher D, Downer M, Tajima T, Sakawa Y, Shoji T, Yugami N, Nishida Y. Proof-of-principle experiments of laser wakefield acceleration using a 1 ps 10 TW Nd:glass laser. ACTA ACUST UNITED AC 1995. [DOI: 10.1063/1.48237] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [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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Yugami N, Kusaka S, Nishida Y. Observation of temporal plasma-wave echoes in an ion-wave regime. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 1994; 49:2276-2281. [PMID: 9961470 DOI: 10.1103/physreve.49.2276] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Nishida Y, Yugami N, Onihashi H, Taura T, Otsuka K. Electron linear accelerator based on Vp x B acceleration scheme. Phys Rev Lett 1991; 66:1854-1857. [PMID: 10043327 DOI: 10.1103/physrevlett.66.1854] [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: 05/23/2023]
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Nakanishi H, Yoshida Y, Ueda T, Kozawa T, Shibata H, Nakajima K, Kurihara T, Yugami N, Nishida Y, Kobayashi T, Enomoto A, Oogoe T, Kobayashi H, Newberger BS, Tagawa S, Miya K, Ogata A. Direct observation of plasma-lens effect. Phys Rev Lett 1991; 66:1870-1873. [PMID: 10043331 DOI: 10.1103/physrevlett.66.1870] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [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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