Tomas Mocek,1 Stephane Sebban,1 L. M. Upcraft,1 I. Bettaibi,1 Philippe Balcou,1 G. Grillon,1 Bedrich Rus,2 David Ros,3 Annie Klisnick,3 Antoine Carillon,3 Gerard Jamelot,3 J. F. Wyart3
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We give an overview of recent 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 x 1017 Wcm-2 into a low-density gas cell containing xenon or krypton, 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 Pd-like Xe, and strong lasing at 32.8 nm on the 3d94d(1S0) - 3d94p(1P1) transition in Ni-like Kr has been demonstrated. Under optimum pumping conditions the Xe IX laser provides about 5 x 109 photons per pulse while the Kr IX laser delivers up to (2-3) x 109 photons per shot. The repetition rate of these X-ray lasers is 10 Hz. The experimental results are discussed and compared to computational simulations in which issues related to plasma formation, electron energy distribution, and atomic processes are addressed.
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Tomas Mocek, Stephane Sebban, L. M. Upcraft, I. Bettaibi, Philippe Balcou, G. Grillon, Bedrich Rus, David Ros, Annie Klisnick, Antoine Carillon, Gerard Jamelot, J. F. Wyart, "Advances in collisionally pumped optical-field-ionization soft x-ray lasers," Proc. SPIE 5197, Soft X-Ray Lasers and Applications V, (19 December 2003); https://doi.org/10.1117/12.504757