Report on CLEO/QELS'93. II. Gas Lasers, X-ray Lasers, Laser Fusion, and Ultrashort Pulses.

AbstractIt is well known that the scattering of ultrashort pulses (USPs) of an electromagnetic field in the X-ray frequency range can be used in diffraction analysis. When such USPs are scattered by various polyatomic objects, a diffraction pattern appears from which the structure of the object can be determined. Today, there is a technical possibility of creating powerful USP sources and the analysis of the scattering spectra of such pulses is a high-precision instrument for studying the structure of matter. As a rule, such scattering occurs at a frequency close to the carrier frequency of the incident USP. In this work, it is shown that for high-power USPs, where the magnetic component of USPs cannot be neglected, scattering at the second harmonic appears. The scattering of USPs by the second harmonic has a characteristic diffraction pattern which can be used to judge the structure of the scattering object; combining the scattering spectra at the first and second harmonics therefore greatly enhances the diffraction analysis of matter. Scattering spectra at the first and second harmonics are shown for various polyatomic objects: examples considered are 2D and 3D materials such as graphene, carbon nanotubes, and hybrid structures consisting of nanotubes. The theory developed in this work can be applied to various multivolume objects and is quite simple for X-ray structural analysis, because it is based on analytical expressions.

Download Full-text

Ultrafast Gated Intensifier Design for Laser Fusion X-Ray Framing Applications

IEEE Transactions on Nuclear Science ◽

10.1109/tns.1984.4333307 ◽

1984 ◽

Vol 31 (1) ◽

pp. 504-508 ◽

Cited By ~ 5

Author(s):

Robert H. Price ◽

Jay D. Wiedwald ◽

Ralph Kalibjian ◽

Stanley W. Thomas ◽

William M. Cook

Keyword(s):

Laser Fusion ◽

X Ray

Download Full-text

Spatially Resolved Suprathermal X-Ray Emission from Laser-Fusion Targets

Physical Review Letters ◽

10.1103/physrevlett.44.579 ◽

1980 ◽

Vol 44 (9) ◽

pp. 579-582 ◽

Cited By ~ 15

Author(s):

N. M. Ceglio ◽

J. T. Larsen

Keyword(s):

Laser Fusion ◽

X Ray ◽

Spatially Resolved

Download Full-text

Formability of laser welded steel/magnesium dissimilar metal with Sn powder-adhesive interlayer

Materials Science-Poland ◽

10.2478/msp-2021-0014 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Tao Tao ◽

Jinshui Liu ◽

Dianwu Zhou ◽

Youruiling Yan ◽

He Zhou

Keyword(s):

Magnesium Alloy ◽

Molten Pool ◽

Adhesive Layer ◽

Metal Vapor ◽

Fusion Welding ◽

Columnar Dendrite ◽

Laser Fusion ◽

Welded Steel ◽

X Ray ◽

Finite Element Software

Abstract The exploratory experiments of laser fusion welding with Sn powder and the automotive adhesive addition were conducted for DP590 dual-phase steel and AZ31B magnesium alloy in an overlap steel-on-magnesium configuration. The characteristics of metal vapor/plasma were analyzed by collecting and analyzing plasma shape and welding spectra. The microstructure of the welded was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray spectrometer (EDS). The temperature field distribution of the joint was simulated by COMSOL finite-element software. The results showed that the transfer of heat from steel to the magnesium alloy is hindered by the adhesive layer, which is conducive to the simultaneous melting of steel and magnesium with large differences in melting and boiling points. In addition, the width of the molten pool increases, but the depth is shallow on the magnesium side. Meanwhile, the recoil pressure induced by the splashing of the molten pool reduces, and the surface quality of the weld is improved. Some intermetallic compounds (IMCs), such as FeSn, Fe1.3Sn, and Fe3Sn, are formed inside the molten pool, while columnar dendrite Mg2Sn phase is also produced. The presence of these phases helps realize the bidirectional metallurgical bonding of steel/magnesium dissimilar metals.

Download Full-text