Virtual Journal of Laser

Author(s): A. Ravasio, L. Romagnani, S. Le Pape, A. Benuzzi-Mounaix, C. Cecchetti, D. Batani, T. Boehly, M. Borghesi, R. Dezulian, L. Gremillet, E. Henry, D. Hicks, B. Loupias, A. MacKinnon, N. Ozaki, H. S. Park, P. Patel, A. Schiavi, T. Vinci, R. Clarke, M. Notley, S. Bandyopadhyay, and M. Koenig
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 Mon Jul 26, 2010

Author(s): T. Kluge, W. Enghardt, S. D. Kraft, U. Schramm, Y. Sentoku, K. Zeil, T. E. Cowan, R. Sauerbrey, and M. Bussmann
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 Mon Jul 19, 2010

Author(s): A. A. Ionin, S. I. Kudryashov, and L. V. Seleznev
Removal rate, air shock, and ablative recoil pressure parameters were measured as a function of laser intensity I_{peak} during nanosecond laser ablation of graphite. Surface vaporization of molten graphite at low intensities I_{peak} <0.15 GW/cm^{2} was observed to transform into its near-critical phase explosion (intense homogeneous boiling) at the threshold intensity I_{PE} ≈0.15 GW/cm^{2} in the form of a drastic, correlated rise of removal rate, air shock, and ablative recoil pressure magnitudes. Just above this threshold (I_{peak} ≥0.25 GW/cm^{2} ) , the explosive mass removal ended up with saturation of the removal rate, much slower increase of the air and recoil pressure magnitudes, and appearance of a visible surface plasma spark. In this regime, the measured far-field air shock pressure amplitude exhibits a sublinear dependence on laser intensity (∝I_{peak}^{4/9} ) , while the source plasma shock pressure demonstrates a sublinear trend (∝I_{peak}^{3/4} ) , both indicating the subcritical character of the plasma.

Author(s): Huayu Li and Hyungson Ki
This paper presents a lattice Boltzmann method for laser interaction with weakly ionized plasmas considering electron impact ionization and three-body recombination. To simulate with physical properties of plasmas, the authors’ previous work on the rescaling of variables is employed and the electr...
[Phys. Rev. E 82, 016703] Published Wed Jul 14, 2010

Author(s): A. Sharma, I. Kourakis, and P. K. Shukla
The spatiotemporal pulse dynamics of a high-power relativistic laser pulse interacting with an electron-positron-ion plasmas is investigated theoretically and numerically. The occurrence of pulse compression is studied. The dependence of the mechanism on the concentration of the background ions in e...
[Phys. Rev. E 82, 016402] Published Fri Jul 02, 2010

Author(s): Ning Jiang, Wei Pan, Bin Luo, Lianshan Yan, Shuiying Xiang, Lei Yang, Di Zheng, and Nianqiang Li
The properties of the leader-laggard chaos synchronization (LLCS) in two mutually coupled external-cavity semiconductor lasers are studied systematically. We theoretically analyze the general conditions for the LLCS based on the symmetric operation mechanism and numerically investigate the influence...
[Phys. Rev. E 81, 066217] Published Wed Jun 23, 2010

Author(s): Syoji Ito, Naoki Toitani, Hiroaki Yamauchi, and Hiroshi Miyasaka
The effect of optical gradient force from a focused laser beam on the fluorescence correlation spectroscopy (FCS) was investigated by a computing method based on Brownian dynamics simulation. A series of calculations revealed that, in relatively shallow optical force potential up to 1.0kT_{R} (T_{R}...
[Phys. Rev. E 81, 061402] Published Fri Jun 18, 2010

Author(s): Hong Guo, Wenzhuo Tang, Yu Liu, and Wei Wei
We present a simple approach to realize truly random number generator based on measuring the phase noise of a single-mode vertical cavity surface emitting laser. The true randomness of the quantum phase noise originates from the spontaneous emission of photons and the random bit generation rate is u...
[Phys. Rev. E 81, 051137] Published Thu May 27, 2010

Author(s): S. X. Hu
To efficiently solve the three-dimensional (3D) time-dependent linear and nonlinear Schrödinger equation, we have developed a large-scale parallel code RSP-FEDVR [B. I. Schneider, L. A. Collins, and S. X. Hu, Phys. Rev. E 73, 036708 (2006)], which combines the finite-element discrete variable repre...
[Phys. Rev. E 81, 056705] Published Wed May 19, 2010

Author(s): Athanasios Gavrielides, David W. Sukow, Guinevere Burner, Taylor McLachlan, John Miller, and Jake Amonette
Numerical and experimental results are presented for an edge-emitting diode laser with delayed optical feedback, where the polarization state of the feedback is rotated such that the natural laser mode is coupled into the orthogonal, unsupported mode. We examine the bifurcation structure and dynamic...
[Phys. Rev. E 81, 056209] Published Wed May 19, 2010