Oxford Centre for High Energy Density Science (OxCHEDS)

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Progress in optic-field-ionization soft X-ray lasers at LOA

LASER PART BEAMS 23:3 (2005) 351-356

Authors:

T Mocek, S Sebban, I Bettaibi, P Zeitoun, G Faivre, B Cros, G Maynard, A Butler, CM McKenna, DJ Spence, A Gonsavles, SM Hooker, V Vorontsov, S Hallou, M Fajardo, S Kazamias, S Le Pape, P Mercere, AS Morlens, C Valentin, P Balcou

Abstract:

We give on overview of recent advances in collisionally pumped optical field-ionization soft X-ray lasers developed at LOA. Saturated amplification has been achieved on the 5d-5p transition in Xe8+ at 41.8 nm, and on the 4d-4p transition in Kr8+ at 32.8 nm. We demonstrate a significant increase of the energy output from the Xe8+ laser driven within two types of wave-guide. Finally, we present results of a pioneering work aimed to set up and characterize the first true soft X-ray laser chain.
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An Analytic Geometry-Variant Approach to Line Ratio Enhancement above the Optically Thin Limit

The Astrophysical Journal American Astronomical Society 629:2 (2005) 1091-1101

Authors:

FM Kerr, SJ Rose, JS Wark, FP Keenan
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20pXK-1 「超高強度レーザーによる高エネルギー単色イオンビーム生成」(プラズマ科学(超高強度レーザー),領域2(プラズマ基礎・プラズマ科学・核融合プラズマ・プラズマ宇宙物理))

(2005) 110

Authors:

反保 元伸, 児玉 了祐, 粟野 信哉, 大屋 章, 中堤 基彰, 中村 浩隆, 薮内 俊敏, 乗松 孝好, 三間 圀興, P Norreys, M Zepf, K krushelnick, A Danger, ターゲットグループ, GODグループ
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Direct observation of the alpha-epsilon transition in shock-compressed iron via nanosecond x-ray diffraction

Physical Review Letters 95 (2005) 075502 4pp

Authors:

JS Wark, D. H. Kalantar, J. F. Belak, G. W. Collins
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Characterization of a picosecond laser generated 4.5 keV Ti K -alpha source for pulsed radiography

Review of Scientific Instruments 76:7 (2005)

Authors:

JA King, K Akli, RA Snavely, B Zhang, MH Key, CD Chen, M Chen, SP Hatchett, JA Koch, AJ MacKinnon, PK Patel, T Phillips, RPJ Town, RR Freeman, M Borghesi, L Romagnani, M Zepf, T Cowan, R Stephens, KL Lancaster, CD Murphy, P Norreys, C Stoeckl

Abstract:

Kα radiation generated by interaction of an ultrashort (1 ps) laser with thin (25 μm) Ti foils at high intensity (2× 1016 W cm2) is analyzed using data from a spherical Bragg crystal imager and a single hit charge-coupled device spectrometer together with Monte Carlo simulations of Kα brightness. Laser to Kα and electron conversion efficiencies have been determined. We have also measured an effective crystal reflectivity of 3.75±2%. Comparison of imager data with data from the relatively broadband single hit spectrometer has revealed a reduction in crystal collection efficiency for high Kα yield. This is attributed to a shift in the K -shell spectrum due to Ti ionization. © 2005 American Institute of Physics.
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