A5065347233- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- Atomic and Molecular Physics
- Magnetic confinement fusion research
- Advanced Fiber Laser Technologies
- Laser Design and Applications
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- High-pressure geophysics and materials
- Ionosphere and magnetosphere dynamics
- Dust and Plasma Wave Phenomena
- Solar and Space Plasma Dynamics
- Astrophysics and Star Formation Studies
- Orbital Angular Momentum in Optics
- Astro and Planetary Science
- Magnetism in coordination complexes
- Plasma Diagnostics and Applications
- Laser Material Processing Techniques
- Solid State Laser Technologies
- Organometallic Complex Synthesis and Catalysis
- Gamma-ray bursts and supernovae
- Fusion materials and technologies
- Planetary Science and Exploration
- Synthesis and characterization of novel inorganic/organometallic compounds
Imperial College London
2015-2024
Ericsson (Hungary)
2022
First Light Fusion
2020-2021
Lawrence Livermore National Laboratory
2000-2020
Rutherford Appleton Laboratory
1993-2020
Université de Bordeaux
2020
Institut Polytechnique de Bordeaux
2020
Centre National de la Recherche Scientifique
2020
SLAC National Accelerator Laboratory
2020
Atomic Weapons Establishment
2020
We demonstrate a technique that uses high-order harmonic generation in molecules to probe nuclear dynamics and structural rearrangement on subfemtosecond time scale. The chirped nature of the electron wavepacket produced by laser ionization strong field gives rise similar chirp photons emitted upon electron-ion recombination. Use this light allows information about be gained with 100-attosecond temporal resolution, from excitation an 8-femtosecond pulse, single shot. Measurements molecular...
We have measured the energy absorption efficiency of high intensity, picosecond laser pulses in low density gases composed large atomic clusters. find that, though average resulting plasmas is low, can be very $(>95%)$, indicating that substantial deposited per particle plasma. Ion measurements confirm this efficient deposition results with (multi-keV) ion temperatures.
This paper provides an up-to-date review of the problems related to generation, detection and mitigation strong electromagnetic pulses created in interaction high-power, high-energy laser with different types solid targets. It includes new experimental data obtained independently at several international laboratories. The mechanisms field generation are analyzed considered as a function intensity spectral range emissions they produce. major emphasis is put on GHz frequency domain, which most...
Exploiting the energetic interaction of intense femtosecond laser pulses with deuterium clusters, it is possible to create conditions in which nuclear fusion results from explosions these clusters. We have conducted high-resolution neutron time-of-flight spectroscopy on plasmas and show that they yield fast bursts nearly monochromatic neutrons temporal duration as short a few hundred picoseconds. Such short, pointlike source now opens up unique possibility using bright pulses, either pump or...
We have executed a series of Young's two-slit experiments to measure the spatial coherence soft x rays produced by high order harmonic generation in helium within 270 480 \AA{} wavelength range. find that harmonics exhibit good fringe visibility and coherence, though is somewhat degraded at intensity because production free electrons through optical field ionization during generation.
Thin liquid sheet jet flows in vacuum provide a new platform for performing experiments the phase, example X-ray spectroscopy. Micrometer thickness, high stability, and optical flatness are key characteristics required successful exploitation of these targets. A novel strategy generating jets is presented this article. Precision nozzles were designed fabricated using resolution (0.2 μm) 2-photon 3D printing generated 1.49 ± 0.04 μm stable, <λ/20-flat isopropanol under normal...
A suite of laser based diagnostics is used to study interactions magnetised, supersonic, radiatively cooled plasma flows produced using the Magpie pulse power generator (1.4 MA, 240 ns rise time). Collective optical Thomson scattering measures time-resolved local flow velocity and temperature across 7–14 spatial positions. The spectrum recorded from multiple directions, allowing more accurate reconstruction vectors. areal electron density measured 2D interferometry; optimisation analysis are...
An analysis of the continuum equations nematic layers subject to large electric or magnetic fields leads simple extrapolation procedures which allow infinite field capacitance be inferred. For a aligning H reciprocal should plotted against 1/H, whereas for an voltage V 1/V except in certain cases where there is change dielectric permittivities between frequencies and measuring fields, when plot used. The optimum experiments accurate routine measurement both principal small sample using...
A third-order correlation system has been developed, which enables the contrast ratio of high-intensity ultra-short laser pulses to be measured on a single shot, with dynamic range better than 108.
We report the observation of harmonics up to 119th in helium, generated using a 1.053-\ensuremath{\mu}m, 1-ps chirped-pulse-amplification laser at intensities 3\ifmmode\times\else\texttimes\fi{}${10}^{14}$ W/${\mathrm{cm}}^{2}$, and measurement their far-field spatial distribution. Complex distributions are found for plateau region near cutoff; angular distribution narrows approximately that predicted by lowest-order perturbation theory.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemically nonrigid six-coordinate metal carbonyl complexes. 1. Polytopal rearrangement and x-ray structure of tetracarbonylbis(trimethylsilyl)ironL. Vancea, M. J. Bennett, C. E. Jones, R. A. Smith, W. G. GrahamCite this: Inorg. Chem. 1977, 16, 4, 897–902Publication Date (Print):April 1, 1977Publication History Published online1 May 2002Published inissue 1 April...
A review is presented here of a number invited papers at the 2008 American Physical Society April meeting [held jointly with High Energy Density Physics/High Laboratory Astrophysics (HEDP/HEDLA) Conference] devoted to intense laser-matter interactions. They include new insights gained from wave-kinetic theory into laser-wakefield accelerators and drift wave turbulence interacting zonal flows in magnetized plasmas; interactions cluster media for generation radiative blast waves; fast electron...
We have experimentally observed anisotropic ion emission from Xe and Ar clusters under intense ultrashort ($\ensuremath{\sim}30\text{ }\text{ }\mathrm{fs}$) laser irradiation, with up to 1.8 times more energetic ions emitted in the direction perpendicular polarization than parallel direction. As pulse length was varied range of 8--160 fs, we found this anisotropy first grow then diminish. Treating electrons inside unexpanded cluster as a harmonic oscillator qualitatively demonstrates how...
A Thomson scattering diagnostic has been used to measure the parameters of cylindrical wire array Z pinch plasmas during ablation phase. The operates in collective regime (α>1) allowing spatially localized measurements ion or electron plasma temperatures and bulk velocity. flow is found accelerate towards axis reaching peak velocities 1.2-1.3×10(7) cm/s aluminium ∼1×10(7) tungsten arrays. Precursor temperature made shortly after formation are correspond kinetic energy converging flow.
We report the observation of amplification an xuv harmonic pulse in laser. The 21st a frequency-doubled 1.3-psec neodymium chirped-pulse-amplification laser was injected into gain region 18-mm-long Ga XXII x-ray amplifier. A approximately 3 recorded for harmonic, relative to unamplified 19th and 23rd harmonics when wavelength tuned overlap 25.11-nm J=2--1 transition.
Exploiting the high absorption efficiency of intense, ultrashort laser pulses in gases atomic clusters we have created plasma filaments with temperatures $>1\mathrm{keV}$ and electron densities excess ${10}^{20}{\mathrm{cm}}^{\ensuremath{-}3}$. Using picosecond pulses, interferometrically measured temporal spatial evolution density these plasmas on a fast $(<50\mathrm{ps})$ time scale. Our measurements indicate that nonlocal heat transport by hot electrons drives ionization wave, data agree...
Abstract The effect of lateral fluorine substituents on the dielectric properties a range nematic liquid crystals is reported. Measurements dipole moments and electric permittivities have been made used to calculate Kirkwood correlation factors over temperature. results show that extent nature correlations are important considerations in determining magnitude anisotropy these materials. Correlation up 1.4 found, providing good evidence for presence parallel associations.
An experimental investigation into the interaction of a supersonic, radiatively cooled plasma jet with argon gas is presented. The formed by ablation an aluminum foil driven 1.4 MA, 250 ns current pulse in radial Z-pinch configuration. outflow consists supersonic (Mach number ∼3–5), dense (ion density ni ∼ 1018 cm−3), highly collimated (half-opening angle ∼2°−5°) surrounded lower halo moving same axial velocity as jet. addition above leads to formation shock plasma, together bow-shock...
An understanding of radiation effects on the evolution shock waves is great importance to many problems in astrophysics. Shock driven by a laser-heated plasma are attractive for laboratory investigation these phenomena. Recent studies intense short-pulse laser interactions with gases atomic clusters indicate potential avenue access this regime radiative hydrodynamics. We have measured energy absorption efficiency high-intensity, picosecond pulses low-density composed large and find that can...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization and x-ray structure of (Me3SiOC)4Fe2(CO)6M. J. Bennett, W. A. G. Graham, R. Smith, P. StewartCite this: Am. Chem. Soc. 1973, 95, 5, 1684–1686Publication Date (Print):March 1, 1973Publication History Published online1 May 2002Published inissue 1 March 1973https://pubs.acs.org/doi/10.1021/ja00786a069https://doi.org/10.1021/ja00786a069research-articleACS PublicationsRequest reuse permissionsArticle Views183Altmetric-Citations31LEARN...
We report on the design, construction, and characterisation of a new class in-vacuo optical levitation trap optimised for use in high-intensity, high-energy laser interaction experiments. The system uses focused, vertically propagating continuous wave beam to capture manipulate micro-targets by photon momentum transfer at much longer working distances than commonly used tweezer systems. A high speed (10 kHz) imaging signal acquisition was implemented tracking levitated droplets position...