Oxford Centre for High Energy Density Science (OxCHEDS)

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Ultrafast x-ray diffraction of laser-irradiated crystals

AIP Conference Proceedings AIP Publishing (1997) 204-208

Authors:

PA Heimann, J Larsson, Z Chang, A Lindenberg, PJ Schuck, E Judd, HA Padmore, PH Bucksbaum, RW Lee, M Murnane, H Kapteyn, JS Wark, RW Falcone
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Vacuum ultraviolet gain measurements in optically pumped LiYF4:Nd3+

Applied Physics B: Lasers and Optics 64:3 (1997) 293-300

Authors:

JS Cashmore, SM Hooker, CE Webb

Abstract:

We present measurements of the net-induced gain on the 5d-4f transition at 186 nm in LiYF4:Nd3+ optically pumped by radiation from a molecular fluorine laser. It is found that for LiYF4: Nd3+ one of a series of potential continuously tunable VUV lasers, relatively strong excited-state absorption results in net-induced loss. The prospects for VUV laser operation being realised in other rare-earth-doped fluorides is discussed.
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X-ray streak camera for ultrafast experiments with use of synchrotron radiation

Conference on Quantum Electronics and Laser Science QELS Technical Digest Series 12 (1997) 30

Authors:

Z Chang, J Larsson, PA Heimann, PH Bucksbaum, RW Falcone, E Judd, HC Kapteyn, RW Lee, X Liu, A Machacek, MM Murnane, HA Padmore, B Shan, PJ Schuck, J Wark

Abstract:

The system of a synchrotron radiation utilizing X-ray streak camera for ultrafast experiments is discussed. The X-ray streak camera includes a short-pulse laser and an ultrafast subpicosecond X-ray detector that are accurately synchronized to the synchrotron. The camera's detector is considered to be the fastest, having a 0.54 ps single shot temporal resolution. The camera also has a pair of meander-type deflection plates found before a magnetic focusing lens which obtains very high sweep speeds on the exit phosphor. The duration of the X-ray beam from the synchrotron source was also measured to be at 5 kev.

XUV Harmonic Generation By Ultra-intense (sub) Picosecond Laser Pulse Irradiation Of Solid Targets

Institute of Electrical and Electronics Engineers (IEEE) (1997) 68-68

Authors:

PA Norreys, D Neely, M Zepf, FN Beg, P Lee, AE Danger, D Chambers, JS Wark, S Moustaizis, R Majoribanks
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Extreme ultraviolet probing of laser imprint in a thin foil using an x-ray laser backlighter

REV SCI INSTRUM 68:1 (1997) 802-805

Authors:

DH Kalantar, LB DaSilva, SG Glendinning, BA Remington, F Weber, SV Weber, MH Key, NS Kim, D Neely, E Wolfrum, J Zhang, JS Wark, A Demir, J Lin, R Smith, GJ Tallents, CLS Lewis, A MacPhee, J Warwick, JP Knauer

Abstract:

For direct drive inertial confinement fusion, a capsule is imploded by directly illuminating the surface with laser light. Beam smoothing and uniformity of illumination affect the seeding of instabilities at the ablation front. We have developed a technique for studying the imprint of a laser beam on a thin foil using an x-ray laser as an extreme ultraviolet (XUV) backlighter. We use multilayer XUV optics to relay the x-ray laser onto the directly driven foil, and then to image the foil modulation onto a charged coupled device camera. This technique allows us to measure small fractional variations in the foil thickness. We have measured the modulation due to imprint from a low intensity 0.35 mu m drive beam incident on a 3 mu m Si foil using an yttrium x-ray laser on Nova. We present results from a similar technique to measure the imprinted modulation due to a low intensity 0.53 mu m drive beam incident on a 2 mu m Al foil using a germanium x-ray laser at the Vulcan facility. (C) 1997 American Institute of Physics.
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