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利用脉宽为1.2ps,功率密度约为1014W/cm2,中心波长为785nm的啁啾脉冲激光聚焦作用于500nm厚的铝膜表面,在其中激发一强冲击波.利用从主脉冲分出的一小部分啁啾脉冲激光构成Michelson干涉仪对冲击波到达靶背面时的卸载速度进行同步诊断.抽运光、探测光之间的时间测试精度优于100fs,因而可以准确测量冲击波通过500nm厚靶材的平均速度.冲击波卸载速度的精确测量得益于啁啾脉冲的超快时间分辨能力.实验结果表明,在以上实验条件下,冲击波的平均速度为(15.150.3)km/s,冲击波卸载时初速约为15.24km/s,对应的冲击波波后压力约为0.3TPa.
Using a pulse width of 1.2ps, the power density of about 1014W / cm2, the center wavelength of 785nm chirped pulse laser focusing on the 500nm thick aluminum film surface, in which a strong shock wave excitation using the main pulse from a small Partially chirped pulsed laser composition The Michelson interferometer synchronizes the unloading speed when the shock wave arrives at the back of the target.The time accuracy between pump light and probe light is better than 100 fs so that the average of the shock wave passing through a 500 nm thick target Speed.The accurate measurement of shock wave unloading speed is benefit from the ultrafast time resolution of chirped pulse.The experimental results show that the average speed of shock wave is (15.150.3) km / s under the above experimental conditions, For 15.24km / s, the corresponding shock wave pressure is about 0.3TPa.