I. V. Bandurkin, Yu. K. Kalynov, and A. V. Savilov High-harmonic large-orbit gyrotrons require long-length operating cavities because of both a weak electron-wave coupling and relatively low electron currents. Since diffraction Q factors of such cavities are very high, a large fraction of the radiated power is dissipated in Ohmic losses. A sectioned ... [Phys. Plasmas 17, 073101 (2010)] published Thu Jul 8, 2010.
Nicolas Sisourat, Nikolai V. Kryzhevoi, Premysl KolorenC, Simona Scheit, Till Jahnke et al. When an atom is electronically excited, it relaxes by emitting a photon or an electron. These carry essential information on the electronic structure of their emitter. However, if an atom is embedded in a chemical environment, another ultrafast non-radiative decay process called interatomic Coulomb ... [Nature Phys. 6, 508 (2010)] published Thu Jul 1, 2010.
R. C. Kalonia, Gautam Mitra, G. S. Singh, R. K. Varma, Manpreet Singh et al. A multiple-laser flash shadowgraphy system has been innovatively designed and developed to study the terminal effects of projectiles. The system has been designed based on modulated laser diodes operated at low voltage and current. In order to study the ballistics effects of small arms, an exposure ... [Opt. Eng. 49, 064303 (2010)] published Thu Jul 1, 2010.
Philipp Rohwetter, Jerome Kasparian, Kamil Stelmaszczyk, Zuoqiang Hao, Stefano Henin et al. Triggering rain on demand is an old dream of mankind, with a huge potential socio-economical benefit. To date, efforts have mainly focused on cloud-seeding using silver salt particles. We demonstrate that self-guided ionized filaments generated by ultrashort laser pulses are also able to induce wate ... [Nat. Photonics 4, 451 (2010)] published Tue Jul 6, 2010.
Jenny Clark and Guglielmo Lanzani Photons as information carriers have the potential to meet the ever-increasing demands on bandwidth and information density in fields such as information and communication technology, biomedicine and computing. Organic semiconductors may be well-suited to such applications, thanks to their ability t ... [Nat. Photonics 4, 438 (2010)] published Tue Jul 6, 2010.
Juan Wang, Yan He, Hong Xia, Li-Gang Niu, Ran Zhang et al. This paper demonstrates the embellishment of existing microfluidic devices with integrated three dimensional (3D) micronanostructures via femtosecond laser micronanofabrication, which, for the first time, proves two-photon photopolymerization (TPP) to be a powerful technology for chip functionalizat ... [Lab Chip 10, 1993 (2010)] published Thu Jul 15, 2010.
T. Kluge, W. Enghardt, S. D. Kraft, U. Schramm, Y. Sentoku et al. A new scheme to efficiently accelerate protons by a single linear polarized high-intensity ultrashort laser pulse using multiple ultrathin foils is proposed. The foils are stacked at a spacing comparable to their thickness and subsequently irradiated by the same laser pulse. The foil thicknesses are ... [Phys. Rev. E 82, 016405 ] published .
A. Ravasio, L. Romagnani, S. Le Pape, A. Benuzzi-Mounaix, C. Cecchetti et al. In this paper we report on the radiography of a shock-compressed target using laser produced proton beams. A low-density carbon foam target was shock compressed by long pulse high-energy laser beams. The shock front was transversally probed with a proton beam produced in the interaction of a high in ... [Phys. Rev. E 82, 016407 ] published .
Yousef I. Salamin Electrons and alpha particles injected midway between two ultrahigh intensity crossed laser beams of radial polarization are shown to be accelerated in vacuum to several gigaelectron volts and to have average energy gradients in excess of 150 GeV/m. A unique model of the crossing beams is suggested, ... [Phys. Rev. A 82, 013823 ] published .
Yaroslav V. Kartashov, Victor A. Vysloukh, and Lluis Torner We address spectral tunneling of walking spatial solitons in photorefractive media with nonlocal diffusion component of the nonlinear response and an imprinted shallow optical lattice. In contrast to materials with local nonlinearities, where solitons traveling across the lattice close to the Bragg ... [Phys. Rev. A 82, 013806 ] published .
Thomas M. Antonsen, Jr. The excitation of radiation by bunched electron beams propagating in miniature corrugated plasma channels is considered. It is shown that the rate at which power is radiated by a beam is characterized by impedance that depends on the properties of the channel. For experimentally obtainable parameter ... [Phys. Plasmas 17, 073112 (2010)] published Fri Jul 30, 2010.
Jeffrey D. Colvin, Kevin B. Fournier, Mark J. May, and Howard A. Scott New advances in fabrication of low-density high-Z-doped foams have opened new windows on understanding how materials that are not in local thermodynamic equilibrium (LTE) are heated and radiate. Simulations are discussed in this paper of the x-ray spectral emissions from laser-irradiated very low-de ... [Phys. Plasmas 17, 073111 (2010)] published Thu Jul 29, 2010.
M. Tampo, S. Awano, P. R. Bolton, K. Kondo, K. Mima et al. High density energetic electrons that are created by intense laser plasma interactions drive MeV proton acceleration. The correlation between accelerated MeV protons and escaped electrons is experimentally investigated at laser intensities in the range of 1010 W/cm with S-polarization. Observed pro ... [Phys. Plasmas 17, 073110 (2010)] published Thu Jul 29, 2010.
V. M. Malkin and N. J. Fisch The range of plasma parameters, where the efficient quasitransient backward Raman amplification (QBRA) of powerful laser pulses is possible, is determined for dense plasmas with multicharged ions. Approximate scalings that portray in a simple way the efficient QBRA range in multidimensional paramete ... [Phys. Plasmas 17, 073109 (2010)] published Tue Jul 27, 2010.
Mathias Arbeiter and Thomas Fennel The interaction of intense extreme ultraviolet (XUV) laser pulses (lambda=32 nm, I=1010 W/cm) with small rare-gas clusters (Ar) is studied by quasiclassical molecular dynamics simulations. Our analysis supports a very general picture of the charging and heating dynamics in finite samples under shor ... [Phys. Rev. A 82, 013201 ] published .
Yanpeng Zhang, Zhiqiang Nie, Yan Zhao, Changbiao Li, Ruimin Wang et al. We experimentally demonstrate the vortex solitons of four-wave mixing (FWM) in multi-level atomic media created by the interference patterns with superposing three or more waves. The modulation effect of the vortex solitons is induced by the cross-Kerr nonlinear dispersion due to atomic coherence in ... [Opt. Express 18, 10963 (2010)] published Wed Jul 7, 2010.
X Yuan, A Robinson, M Quinn, D Carroll, M Borghesi et al. The collimating effect of self-generated magnetic fields on fast-electron transport in solid aluminium targets irradiated by ultra-intense, picosecond laser pulses is investigated in this study. As the target thickness is varied in the range of 25 [mu]m to 1.4 mm, the maximum energies of protons acc ... [New J. Phys. 12, 063018 (2010)] published Thu Jul 1, 2010.
L. Young, E. P. Kanter, B. Krssig, Y. Li, A. M. March et al. An era of exploring the interactions of high-intensity, hard X-rays with matter has begun with the start-up of a hard-X-ray free-electron laser, the Linac Coherent Light Source (LCLS). Understanding how electrons in matter respond to ultra-intense X-ray radiation is essential for all applications. H ... [Nature 466, 56 (2010)] published Thu Jul 1, 2010.
Russell A. Burdt, Yoshifumi Ueno, Yezheng Tao, Sam Yuspeh, Mark S. Tillack et al. The distance over which the charge state distribution evolves during the expansion of laser produced Sn plasma in vacuum is investigated experimentally. This distance is found to be less than 6 cm with a planar target irradiated by a 1.064 [mu]m laser at 8.3 x 10 W/cm but greater than 60 cm when a ... [Appl. Phys. Lett. 97, 041502 (2010)] published Fri Jul 30, 2010.
Nasr A. M. Hafz, Tae Jun Yu, Seong Ku Lee, Tae Moon Jeong, Jae Hee Sung et al. Advanced laser wakefield accelerators offer electron beams which could be useful for many applications. However, the problem of stabilizing the electron beam parameters has not been resolved yet. Here, we report the generation of a relativistic electron beam with a stabilized pointing angle of 2 mra ... [Appl. Phys. Express 3, 076401 (2010)] published Mon Jul 26, 2010.
