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Journal Articles

Investigations of relativistic laser plasma from micron-sized Ar clusters

Fukuda, Yuji; Yamakawa, Koichi

Progress in Ultrafast Intense Laser Science II, p.231 - 251, 2007/00

To better understand a fundamental aspect of the laser cluster interaction, we have carried out systematic investigations of X-ray radiation properties of high-density and high-temperature cluster plasma, created by the action of superintense laser irradiation. The interrelationship between the X-ray radiation properties and ion kinetic energies has been for the first time examined by the simultaneous measurements of X-ray radiation spectra and ion energy spectra. Time scale and mechanism of X-ray emission process have been discussed based on a time-dependent plasma kinetics model. Moreover, in order to demonstrate the practical capability of X-rays thus produced, the pulse X-ray diffraction has been examined from Si crystal with this source.

Journal Articles

Structure and dynamics of cluster plasmas created by ultrashort intense laser fields

Fukuda, Yuji; Kishimoto, Yasuaki; Masaki, Tomohiro*; Yamakawa, Koichi

Physical Review A, 73(3), p.031201_1 - 031201_4, 2006/03

 Times Cited Count:35 Percentile:78.71

An ultrashort, intense laser-cluster interaction and a resultant structure formation are investigated in detail by employing a particle code including relaxation and ionization processes. In addition to a laser-induced polarization field, we have found that an ambipolar radial electric field and an internal/external sheath field play a key role in a disassembling dynamics of the cluster. Electrons and ions show a complex behavior leading to a prominent dip structure in electron energy distribution and a double structure in ion density and energy distributions for higher charge states.

Journal Articles

Optimized energetic particle emissions from Xe clusters in intense laser fields

Fukuda, Yuji; Yamakawa, Koichi; Akahane, Yutaka; Aoyama, Makoto; Inoue, Norihiro*; Ueda, Hideki; Kishimoto, Yasuaki

Physical Review A, 67(6), p.061201_1 - 061201_4, 2003/06

 Times Cited Count:59 Percentile:88.51(Optics)

We have probed the interaction of intense laser fields with Xe clusters by measuring the energy and charge state distributions of emitted ions and electrons using ultrafast 20 fs pulses. This work demonstrates that the energetic particle emissions from laser-cluster interactions can be optimized by manipulating the character of ultrafast laser pulses, i.e. pulse duration and sign of chirp.

Journal Articles

Ion explosion and multi-mega-electron-volt ion generation from an underdense plasma layer irradiated by a relativistically intense short-pulse laser

Yamagiwa, Mitsuru; Koga, J. K.; L.N.Tsintsadze*; Ueshima, Yutaka*; Kishimoto, Yasuaki

Physical Review E, 60(5), p.5987 - 5990, 1999/11

 Times Cited Count:19 Percentile:62.35(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

MeV ion generation by an ultra-intense short-pulse laser; Application to positron emitting radionuclide production

Yamagiwa, Mitsuru; Koga, J. K.

Journal of Physics D; Applied Physics, 32(19), p.2526 - 2528, 1999/00

 Times Cited Count:22 Percentile:67.49(Physics, Applied)

no abstracts in English

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