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20 results on '"Merdji, H."'

3. The SCSS test accelerator Free-Electron Laser seeded by harmonics produced in gas

Author

Lambert, G., primary, Hara, T., additional, Tanikawa, T., additional, Garzella, D., additional, Carré, B., additional, Ishikawa, T., additional, Kitamura, H., additional, Shintake, T., additional, Tahara, K., additional, Tanaka, Y., additional, Yabashi, M., additional, Bougeard, M., additional, Labat, M., additional, Merdji, H., additional, Salières, P., additional, Gobert, O., additional, Chubar, O., additional, and Couprie, M. E., additional

Published
2009
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5. Laser produced X-ray source in the 10-60 keV range at 1 kHz. Modified irradiation schemes in order to reach medical imaging quality

Author

Albert, F, Sjogren, A, Wahlström, Claes-Göran, Svanberg, Sune, Olsson, C, Merdji, H, Albert, F, Sjogren, A, Wahlström, Claes-Göran, Svanberg, Sune, Olsson, C, and Merdji, H

Abstract

By tightly focusing ultra-short pulses from a Ti:sapphire terawatt laser onto a high-Z metallic target, hard x-ray pulses of short duration are produced. In most of our previous work concerning x-rays, a 150 mJ laser pulse with a 110 A duration has been used. Using mostly tin and tantalum targets, hard x-rays in the 10-60 keV range have been produced and used in differential absorption imaging around the K-alpha absorption edge of a contrast agent and also in imaging employing gated viewing for suppression of scattered radiation. In order to increase the x-ray yield (shortening the acquisition time) an increase in the laser repetition rate is desirable while still staying in the K-alpha energy regime. We have used a I kHz repetition-rate laser delivering 35 fs pulses in order to work towards these goals. We have clear evidence of hard x-ray generation above 30 keV, even for low laser pulse energies. We also studied the effect of a fs prepulse. The medical imaging capability of the source was explored. The use of a prepulse has been optimized in order to improve the image quality as well as the overall x-ray generation yield.

Published
2001

6. Interaction d'impulsions VUV intenses avec les solides luminescents

Author

Belsky, A., primary, Carré, B., additional, Fedorov, N., additional, Feldbach, E., additional, Gaudin, J., additional, Guizard, S., additional, Geoffroy, G., additional, De Grazia, M., additional, Kirm, M., additional, Martin, P., additional, Merdji, H., additional, Nagirnyi, V., additional, and Petite, G., additional

Published
2006
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16. Nouvelles perspectives de diagnostics de plasmas denses par génération d'harmoniques d'ordre élevé

Author

Merdji, H., primary, Salières, P., additional, Hergott, J.-F., additional, Monot, P., additional, d'Oliveira, P., additional, Auguste, T., additional, Carré, B., additional, Descamps, D., additional, Lyngå, C., additional, Norin, J., additional, L'Huillier, A., additional, Wahlström, C.-G., additional, Bellini, M., additional, Hänsch, T. W., additional, and Hüller, S., additional

Published
2001
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17. Measurement of the wavefront of XUV sources

Author

Le Pape, S., primary, Zeitoun, Ph., additional, Hergot, J.-F., additional, Carré, B., additional, Dhez, P., additional, François, M., additional, Idir, M., additional, Merdji, H., additional, Ros, D., additional, Carillon, A., additional, and Salières, P., additional

Published
2001
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