Detection of flyer velocity by side-on shadowgraph system in equation of state experiment

A side-on shadowgraph system was developed to dectect the velocity of the target in the equation of state experiments, using the visible laser as detection beam. The equation of state experiments were carried out on the high power excimer laser system called “HeavenⅠ” with laser wavelength of 248.5 nm. The velocity of 50 μm thick aluminum target was 3.28 km/s with laser intensity of 8.3×1011 W/cm2, and the velocity of 13 μm thick aluminum target with 100 μm thick ablator was 2.52 km/s with laser intensity of 4.7×1011 W/cm2. Through analysing the error between the experiment and the caculation, the maximum angle between detection beam and target was 2.06°, and the error cased by such an angle could be neglected for the accuracy of the experiments.