21 October 1999 Transient collisional excitation x-ray laser experiments on the P102 laser at CEA-LV
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Abstract
Recent experiments, performed at the C.E.A./Limeil-Valenton P102 laser facility on the Ni-like transient collisional scheme, are reported in this paper. They mainly aimed at enhancing the efficiency and improving the optical properties of the already demonstrated 4d J equals 0/4p J equals 1 Ag19+ x-ray laser at 13.9 nm. The now classical 2- stage traveling-wave irradiation of slab targets was used, the illumination sequence being constituted of a long (600 ps) low-flux (0.5 - 11 J) laser pulse followed (200 ps later) by a short (< 1 ps) high intensity (1 - 20 J) one. The work novelty was the use of frequency-doubled pulses, either for the pre-forming or the pumping one. Various combinations ((omega) -(omega) , 2(omega) -(omega) , (omega) - 2(omega) ) have been investigated in terms of lasing performances. High gains, around 34/cm, have been measured and saturation achieved for target lengths above 4 mm. A strong enhancement, up to a few (mu) J, of the x-ray laser output has been observed, due to traveling-wave irradiation method, while the emission duration was decreased to less than 10 ps, resulting in a 300 kW source. Moreover, under specific laser conditions, a second lasing line at 16 nm was detected. Finally, the possibility of cavity operating transient collisional x-ray lasers has been demonstrated.
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Jean-Luc Miquel, Jean-Luc Miquel, Nathalie Blanchot, Nathalie Blanchot, Laurence Bonnet, Laurence Bonnet, Sylvie Jacquemot, Sylvie Jacquemot, Annie Klisnick, Annie Klisnick, Jaroslav Kuba, Jaroslav Kuba, David Ros, David Ros, P. Fourcade, P. Fourcade, Gerard Jamelot, Gerard Jamelot, Fabien Dorchies, Fabien Dorchies, Jean-Christophe Chanteloup, Jean-Christophe Chanteloup, } "Transient collisional excitation x-ray laser experiments on the P102 laser at CEA-LV", Proc. SPIE 3776, Soft X-Ray Lasers and Applications III, (21 October 1999); doi: 10.1117/12.366684; https://doi.org/10.1117/12.366684
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