Preparation and characteristics of laserdriven energetic composite flyer

Vacuum magnetron sputtering technology was used to prepare three kinds of composite films: CuO/Al2O3/Al,(CuO/Al)Ⅱ/CuO/ Al2O3/Al,and (CuO/Al)Ⅷ/ Al2O3/Al, and the performance of the materials were characterized by scanning electron microscopy and confocal microscopy. The results showed that the surface of the films were smooth, and the interfaces between different layers were compact. Then, photonic Doppler velocimetry was used to measure the speeds of the flyers. The results showed that the flyers were placed in front of the position where the air was ionized by laser so that energy shielding effect caused by laser ionization of air could be improved. Besides, the energetic film as an ablative layer such as CuO/Al helped to improve the speed of flyers. When the thickness of the ablation layer was unchanged, the way of increasing cycle and reducing the film thickness of each layer was used to improve the degree of reaction and reduce the rising time. On the condition of the same laser energy density, that of (CuO/Al)Ⅷ/ Al2O3/Al was less than that of (CuO/Al)Ⅱ/CuO/Al2O3/Al.