Time-resolved observation of the femto-second laser ablation dynamics by using the plasma X-ray laser

Hasegawa, Noboru; Nishikino, Masaharu; Kaihori, Takeshi; Kawachi, Tetsuya; Yamagiwa, Mitsuru; Yamamoto, Minoru*; Tomita, Takuro*; Minami, Yasuo*; Takei, Ryota*; Suemoto, Toru

We have developed the femto-second laser pump and soft X-ray laser probe system in order to observe the dynamical processes of the femto-second laser ablation. By using this system, we succeed to obtain the temporal evolution of the soft X-ray reflectivity from the laser induced Pt surface. The results lead that the rate of decrease in the reflectivity of the probe beam has a non-linear relation with the pump laser fluence.