F Plé

Publications (8)6.99 Total impact

• Source

  Available from: Kevin Cassou

  Article: Quantitative study of 10 Hz operation of a soft x-ray laser-energy stability and target considerations.

  F Lindau, O Lundh, A Persson, K Cassou, S Kazamias, D Ros, F Plé, G Jamelot, A Klisnick, S de Rossi, D Joyeux, B Zielbauer, D Ursescu, T Kühl, C-G Wahlström
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  ABSTRACT: A soft x-ray laser from Ni-like Mo, pumped in grazing incidence (GRIP), is analyzed with regard to high repetition rate operation. Reliable lasing is obtained, but with significant energy fluctuations attributed mainly to beam pointing jitter from the pump laser. Two modes of operation are compared: continuously moving target and stationary target. With a moving target the soft X-ray output is constant on average, whereas the repeated use of the same target position leads to a pulse energy which increases for several tens of shots. This effect might be caused by improved guiding of the pump laser in the formed groove and the removal, through laser ablation, of the oxide layer on the target surface.
  Optics Express 08/2007; 15(15):9486-93. · 3.59 Impact Factor
• Source

  Available from: Kevin Cassou

  Article: Optimization toward a high-average-brightness soft-x-ray laser pumped at grazing incidence.

  K Cassou, S Kazamias, D Ros, F Plé, G Jamelot, A Klisnick, O Lundh, F Lindau, A Persson, C-G Wahlström, S de Rossi, D Joyeux, B Zielbauer, D Ursescu, T Kühl
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  ABSTRACT: We report the near-field imaging characterization of a 10 Hz Ni-like 18.9 nm molybdenum soft-x-ray laser pumped in a grazing incidence pumping (GRIP) geometry with a table-top laser driver. We investigate the effect of varying the GRIP angle on the spatial behavior of the soft-x-ray laser source. After multiparameter optimization, we were able to find conditions to generate routinely a high-repetition-rate soft-x-ray laser with an energy level of up to 3 microJ/pulse and to 6x10(17) photons/s/mm2/mrad2/(0.1% bandwidth) average brightness and 1x10(28) photons/s/mm2/mrad2/(0.1% bandwidth) peak brightness.
  Optics Letters 02/2007; 32(2):139-41. · 3.40 Impact Factor
• Chapter: A High Repetition-Rate, Petawatt Class Ti:Sapphire Laser Dedicated to Coherent X-UV Generation at LASERIX

  F. Plé, M. Pittman, J-P. Chambaret, G. Jamelot
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  ABSTRACT: We have recently demonstrated amplification in a Ti:Sapphire laser system up to 30 Joules before compression at the record repetition rate of 0.1 Hz. This CPA Ti: Sapphire laser system is the first femtosecond petawatt class laser system running at a high repetition rate of 0.1Hz. Such performances have been obtained thanks to the particular design of the last booster amplifier. In this paper, we will present the last results obtained on this system and the different strategies we have carried out for counteracting the two most limiting factors for high energy amplification that are the parasitic lasing in the large aperture Ti: Sapphire crystal and the spatial homogenisation of the pump laser beams. This laser will be used as a driver of the LASERIX facility.
  12/2006: pages 23-27;
• Chapter: LASERIX : A Multi X-Ray/XUV Beamline High Repetition-Rate Facility

  D. Ros, G. Jamelot, M. Pittman, F. Plé, S. Kazamias, A. Klisnick, J-C. Lagron, K. Cassou, O. Guilbaud, J-P. Chambaret, S. Sebban, P. Zeitoun
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  ABSTRACT: LASERIX is a high-power laser facility intended to realize and use for applications transient collisional X-ray laser (XRL) beamlines at various wavelengths. In addition new types of XRL schemes giving rise to emission at short wavelengths will be developed using the high energy LASERIX driver. Thus, this laser facility will both offer Soft XRLs in the 30-7 nm range and auxiliary IR beam that could also be used to produce XUV sources. This experimental configuration highly enhances the scientific opportunities of the facility. Indeed it will be possible to realize both X-ray laser experiments and more generally pump/probe experiments, mixing IR and XUV sources. Then, this laser facility will be useful for the community, opening a large scale of XUV laser investigations.
  12/2006: pages 191-199;
• Source

  Available from: Kevin Cassou

  Chapter: A 10 Hz, 3 Microjoule Transient Soft X-Ray Laser Pumped in Grazing Incidence

  S. Kazamias, K. Cassou, D. Ros, F. Plé, G. Jamelot, A. Klisnick, O. Lundh, F. Lindau, A. Persson, C.-G. Wahlström, S. de Rossi, D. Joyeux, B. Zielbauer, D. Ursescu, T. Kühl
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  ABSTRACT: We present recent results on the extensive investigation of a Ni-like Mo X-ray laser pumped in the transient regime and GRIP configuration (grazing incidence pumping). The pump laser was the 10 Hz, multiterawatt, Ti:Sa Lund University laser system in Sweden. The main diagnostic was a monochromatic near-field imaging system with a 1.7 micron spatial resolution. Intense lasing was observed routinely at 18.9 nm with up to 3 microJoule output energy and stable operation at 10 Hz was demonstrated in 100-shot sequences. We have investigated the role of several pumping parameters, in particular the relative energy and delay between the long and short pulse. A preliminary investigation was done on the effect of a low energy prepulse. Finally, the grazing angle of the pumping pulse was systematically varied between 13 and 21°, while keeping all parameters constant. We show that this multi-parameter scan leads to a well-defined optimal zone of operation and better understanding of the GRIP configuration.
  12/2006: pages 173-181;
• Chapter: X-Ray Imaging of the Heating Zone of Non-Normal Incidence Pumped XRL Plasma

  B. Zielbauer, D. Ursescu, T. Kühl, S. Kazamias, K. Cassou, D. Ros, A. Klisnick, F. Plé, S. de Rossi, D. Joyeux, O. Lundh, F. Lindau, A. Persson, C.-G. Wahlström
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  ABSTRACT: Soft x-ray emission, above 600 eV, from a grazing incidence pumped Ni-like Mo x-ray laser (GRIP-XRL) [1] plasma was investigated. Using a pinhole camera looking along the target surface, perpendicular to the direction of the XRL emission, spatially-resolved information was obtained with a resolution which was limited only by the pinhole size of 10 μm. The relative distance from the target surface to the plasma zone heated by th e picosecond pulse was investigated for different GRIP angles, energy ratios and delays between the plasma producing and the plasma heating pulses.
  12/2006: pages 75-80;
• Chapter: Recent Progress in X-Ray Laser Development and Applications at LIXAM

  A. Klisnick, D. Ros, G. Jamelot, S. Kazamias, M. Pitmann, K. Cassou, F. Plé, O. Guilbaud, I. R. Al’Miev, C. Möller, [......], J. Dubau, D. Joyeux, C.-G. WahlstrÖm, T. Kühl, B. Rus, H. Bercego, O. Larroche, J.-P. Chambaret, Ph. Zeitoun, P. Velarde
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  ABSTRACT: We present an overview of the recent progress achieved in the development of X-ray lasers and demonstration of applications by the LIXAM team, in collaboration with other groups. Lasing at 10 Hz was demonstrated at 18.9 nm in Ni-like Mo with a 30 µW average power, using transient pumping in the grazing incidence geometry. New numerical simulations have been developed to study spatial and temporal features of current and future X-ray lasers. The technique of interference microscopy with an X-ray laser beam was applied to the investigation of laser-induced damages in optical materials exposed to sub-ns laser pulses. Finally the construction of a 0.5 PW, 0.1 Hz Ti-Sa laser, the driver of the LASERIX facility, was successfully completed.
  12/2006: pages 13-22;
• Article: Laser XUV haute cadence pompé par laser Titane : Saphir, vers la station LASERIX

  S. Kazamias, K Cassou, D. Ros, F Plé, G. Jamelot, A. Klisnick, O Lundh, F Lindau, A Persson, C-G Wahlström, S de Rossi, D Joyeux, B. Zielbauer, D. Ursescu
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  ABSTRACT: Nous présentons des résultats récents de laser X collisionnel transitoire pompé en incidence rasante à haut taux de répétition. Ils ont été obtenus à partir du laser de pompe Titane :Saphir 30 TW disponible sur l'installation européenne du LLC à Lund (Suède). Nous avons démontré lors de cette expérience qu'il était possible d'obtenir en routine près de 3 microjoule par impulsion à 18,9 nm avec seulement 1 J d'énergie de pompe infrarouge. Nous avons plus particulièrement étudié l'influence de l'angle de rasance sur cible de l'impulsion laser qui vient pomper le plasma, quelques centaines de picosecondes après la première impulsion responsable de sa création. Un système d'imagerie XUV à haute résolution nous a en effet permis d'obtenir des informations précieuses sur la pupille de sortie du laser X, comme l'énergie totale dans la tache mais aussi la distance d'émission par rapport à la cible, et encore les dimensions horizontale et verticale de la source.
  http://dx.doi.org/10.1051/jp4:2006138003.