Investigations on femtosecond-pulse-driven soft X-ray lasers using a gas puff target irradiated with a Ti:Sapphire laser H. Fiedorowicz, A. Bartnik, M. Szczurek, T. Mocek, H.J. Shin, Y.H. Cha, D.G. Lee, K.H. Hong et C.H. Nam J. Phys. IV France, 11 PR2 (2001) Pr2-197-Pr2-200 DOI: 10.1051/jp4:2001237