Oxford Centre for High Energy Density Science (OxCHEDS)

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Dramatic enhancement of xuv laser output using a multimode gas-filled capillary waveguide

Physical Review A - Atomic, Molecular, and Optical Physics 71:1 (2005)

Authors:

T Mocek, CM McKenna, B Cros, S Sebban, DJ Spence, G Maynard, I Bettaibi, V Vorontsov, AJ Gonsavles, SM Hooker

Abstract:

We report a significant increase of the output of a 41.8-nm Xe 8+ laser achieved by means of multimode guiding of high-intensity femtosecond laser pulses in a gas-filled dielectric capillary tube. The optimized lasing signal from a 15-mm-long capillary was nearly an order of magnitude higher than that from a gas cell of the same length. Simulations of the propagation of the pump laser pulse in the capillary confirmed that this enhancement is due to reflections from the capillary wall, which increase the length of the Xe 8+ plasma column generated. The influence of gas pressure and focusing position on the lasing is also presented. © 2005 The American Physical Society.
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Experimental characterization of a strongly coupled solid density plasma generated in a short-pulse laser target interaction

Contributions to Plasma Physics 45:3-4 (2005) 284-292

Authors:

G Gregori, SB Hansen, R Clarke, R Heathcote, MH Key, J King, RI Klein, N Izumi, AJ Mackinnon, SJ Moon, HS Park, J Pasley, N Patel, PK Patel, BA Remington, DD Ryutov, R Shepherd, RA Snavely, SC Wilks, BB Zhang, SH Glenzer

Abstract:

We have measured high resolution copper Kα spectra from a picosecond high intensity laser produced plasma. By fitting the shape of the experimental spectra with a self-consistent-field model which includes all the relevant line shifts from multiply ionized atoms, we are able to infer time and spatially averaged electron temperatures (Te) and ionization state (Z) in the foil. Our results show increasing values for Te and Z when the overall mass of the target is reduced. In particular, we measure temperatures in excess of 200 eV with Z ∼ 13-14. For these conditions the ion-ion coupling constant is Γii ∼ 8-9, thus suggesting the achievement of a strongly coupled plasma regime. © 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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Monoenergetic electron beams from a laser-plasma accelerator

Optics InfoBase Conference Papers (2005)

Authors:

SPD Mangles, CD Murphy, Z Najmudin, AGR Thomas, JL Collier, AE Dangor, EJ Divall, PS Foster, JG Gallacher, CJ Hooker, DA Jaroszynski, AJ Langley, WB Mori, PA Norreys, FS Tsung, R Viskup, BR Walton, K Krushelnick

Abstract:

Monoenergetic electron beams (dE/E < 5%) produced by the interaction of a 12TW, 40fs laser pulse with underdense plasma have been observed, in contrast to all previous experiments, which produced energy spreads ~100%. © 2005 Optical Society of America.
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Observation of monoenergetic relativistic electron beams from intense laser - plasma interactions

Optics InfoBase Conference Papers (2005)

Authors:

SPD Mangles, CD Murphy, Z Najmudin, AGR Thomas, BR Walton, AE Dangor, K Krushelnick, PS Foster, CJ Hooker, A Langley, J Collier, PA Norreys, J Gallacher, R Viskup, DA Jarosynski, WB Mori, FS Tsung

Abstract:

We report the observation of monoenergetic electron beams (dE/E < 5%) produced by the interaction of a 12TW, 40fs laser pulse with underdense plasma, in contrast to all previous experiments, which produced energy spreads ~100%. © 2005 Optical Society of America.

Observation of monoenergetic relativistic electron beams from intense laser - plasma interactions

Optics InfoBase Conference Papers (2005)

Authors:

SPD Mangles, CD Murphy, Z Najmudin, AGR Thomas, BR Walton, AE Dangor, K Krushelnick, PS Foster, CJ Hooker, A Langley, J Collier, PA Norreys, J Gallacher, R Viskup, DA Jarosynski, WB Mori, FS Tsung

Abstract:

We report the observation of monoenergetic electron beams (dE/E < 5%) produced by the interaction of a 12TW, 40fs laser pulse with underdense plasma, in contrast to all previous experiments, which produced energy spreads ~100%. © 2005 Optical Society of America.