Characterization of collisionally pumped optical-field-ionization soft X-ray lasers |
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Authors: | T Mocek S Sebban I Bettaibi LM Upcraft P Balcou P Breger P Zeitoun S Le Pape D Ros A Klisnick A Carillon G Jamelot B Rus JF Wyart |
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Institution: | (1) Laboratoire d Optique Appliquée (LOA), ENSTA – Ecole Polytechnique, 91761 Palaiseau, France;(2) Service des Photons, Atomes et Molecules, CEA, 91191 Gif-sur-Yvette, France;(3) LIXAM, Université Paris Sud, 91405 Orsay, France;(4) Department of X-ray Lasers, Institute of Physics, Na Slovance 2, 8-18221 Prague, Czech Republic;(5) Laboratoire Aimé Cotton, Université Paris Sud, 91405 Orsay, France |
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Abstract: | We give an overview of recent experimental results on optical-field-ionization collisional soft X-ray lasers developed at LOA. By focusing a 30-fs, circularly polarized Ti-sapphire laser pulse at an intensity of up to 8×1017 Wcm-2 into a low-density gas cell containing Xe or Kr, we produced a few mm long plasma column for soft X-ray amplifier. Saturated amplification has been achieved on the 4d95d(1S0)–4d95p(1P1) transition at 41.8 nm in Xe8+, and on the 3d94d(1S0)–3d94p(1P1) transition in Kr8+ at 32.8 nm. Under optimum pumping conditions the Xe8+ laser provides about (5±2)×109 photons per pulse whilst the Kr8+ laser delivers up to (2.5±1)×109 photons per shot. The repetition rate of these soft X-ray lasers is 10 Hz. The beam wavefront of the Xe8+ laser has been measured by a Shack–Hartmann soft X-ray wavefront sensor, and the pulse duration by a cross-correlation technique. PACS 42.55.Vc; 32.30.Rj; 52.50.Jm |
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