Oxford Centre for High Energy Density Science (OxCHEDS)

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Spatial and temporal coherence measurements of harmonics of a 1053 nm, 2.5 ps laser interacting with solid surfaces

INST PHYS CONF SER (1996) 452-454

Authors:

J Zhang, M Zepf, PA Norreys, AE Dangor, M Bakarezos, CN Danson, A Dyson, AP Fews, P Gibbon, P Lee, P Loukakos, MH Key, S Moustaizis, D Neely, FN Walsh, JS Wark

Abstract:

We present measurements of the spatial and temporal coherence lengths of the 4th harmonic of a 1053 nm, 2.5 ps laser generated during high intensity (up to 10(19) wcm(-2)) interactions with a solid target. Coherence lengths were measured by use of a Young's double slit interferometer. The effective source size, as defined by the Van Cittert-Zernicke theorem, was found to be 10 similar to 12 mu m, and the coherence time was observed to be in the range 0.02 similar to 0.4 ps.
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Spatial and temporal coherence measurements of harmonics of a 1053 nm, 2.5 ps laser interacting with solid surfaces

X-RAY LASERS 1996 (1996) 452-454

Authors:

J Zhang, M Zepf, PA Norreys, AE Dangor, M Bakarezos, CN Danson, A Dyson, AP Fews, P Gibbon, P Lee, P Loukakos, MH Key, S Moustaizis, D Neely, FN Walsh, JS Wark
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Spectroscopy of compressed high energy density matter

PHYSICAL REVIEW E 53:6 (1996) 6396-6402

Authors:

NC Woolsey, A Asfaw, B Hammel, C Keane, CA Back, A Calisti, C Mosse, R Stamm, B Talin, JS Wark, RW Lee, L Klein
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Pulse generation and shaping using the ultra-high-power laser system: VULCAN

Proceedings of SPIE--the International Society for Optical Engineering SPIE, the international society for optics and photonics 2633 (1995) 316-323

Authors:

Colin N Danson, LJ Barzanti, Christopher B Edwards, SA Edwards, CN Harrison, CJ Mistry, David Neely, Peter A Norreys, David A Pepler, DA Rodkiss, Ian N Ross, WT Toner, TB Winstone, FN Walsh, RWW Wyatt
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Laser ablation of polymeric materials at 157 nm

Journal of Applied Physics 77:6 (1995) 2343-2350

Authors:

A Costela, I García-Moreno, F Florido, JM Figuera, R Sastre, SM Hooker, JS Cashmore, CE Webb

Abstract:

Results are presented on the ablation by 157 nm laser radiation of polytetrafluoroethylene (PTFE), polyimide, polyhydroxybutyrate (PHB), poly(methyl methacrylate) (PMMA), and poly(2-hydroxyethyl methacrylate) with 1% of ethylene glycol dimethacrylate as a crosslinking monomer. Direct photoetching of PHB and undoped PTFE is demonstrated for laser fluences ranging from 0.05 to 0.8 J/cm2. The dependence of the ablation process on the polymer structure is analyzed, and insight into the ablation mechanism is gained from an analysis of the data using Beer-Lambert's law and the kinetic model of the moving interface. Consideration of the absorbed energy density required to initiate significant ablation suggests that the photoetching mechanism is similar for all the polymers studied. © 1995 American Institute of Physics.
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