We report a strong prepulse dependence of the soft X-ray emissionfrom plasmas created by 150 fs Ti:Sapphire laser pulses on solids. By reflecting a portion of the main pulse, a prepulse was generated, variable in time delay and relative intensity. The laser pulses were focused onto plane samples of aluminum and vanadium with a main pulse intensity of about 2.5 x 10~(16) W/cm~2. With no prepulse, practically no soft X-ray radiation from Al~(9+) and Al~(10+) was observed, whereas a prepulse to main pulse ratio of about 0.5percent, with the prepulse preceding the main pulse by more than 2 ns produced the strongest soft X-ray output.
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机译：我们报告了固体对150 fs Ti：蓝宝石激光脉冲产生的等离子体产生的软X射线发射的强预脉冲依赖性。通过反射一部分主脉冲，产生了一个预脉冲，该预脉冲的时间延迟和相对强度是可变的。激光脉冲聚焦到铝和钒的平面样品上，主脉冲强度约为2.5 x 10〜（16）W / cm〜2。在没有预脉冲的情况下，几乎没有观察到来自Al〜（9+）和Al〜（10+）的软X射线辐射，而预脉冲与主脉冲的比率约为0.5％，其中预脉冲在主脉冲之前的距离大于2 ns产生最强的软X射线输出。
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