Uzbek Journal of Physics Vol.20(№4) 2018 PP.203-208 203 ABLATION AND DRIVE OF TYPICAL MULTI-LAYER FLYERS BY HIGH POWER LASER BEAM Ruiqi Shen 1 , Lizhi Wu 1 , Shaojie Chen 1,2 , Wei Zhang 1 , Yinghua Ye 1 , Haonan Zhang 1 1 School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China, rqshen@njust.edu.cn 2 Beijing Power Machinery Institute, Beijing 100074, China Laser driving technology is an important technology in high energy physics, shock wave physics and explosive initiation application. In this paper, velocities and impact stresses of four types of laser-driven flyers (Al, Al/Al 2 O 3 /Al, CuO/Al 2 O 3 /Al, (CuO/Al)/Al 2 O 3 /Al) prepared via magnetron sputtering were obtained by photonic Doppler velocimetry (PDV) and a self-made polyvinylidene fluoride (PVDF) stress sensor at ns-class pulse width.The results showed that velocities and integrity of flyers were influenced by their diameters. Compared with Al single-layer flyer, other multi-layer flyers with Al 2 O 3 insulation layer owned lower velocity but better integrity and initiation properties.CuO/Al as the ablation layer enhanced the velocities and shock initiation properties of multi-layer flyers. Velocity of a flyer improved with the increasing laser energy while shock initiation property did not perform in the same way. These results provide some references for the design of multi-layer flyers applied to laser- driven initiation technology. I. INTRODUCTION Laser-driven flyer technology is definedthat using substances with high pressure and temperature produced by laser ablation to drive the flyer to reach high velocity. It is widely used in dynamic high-pressure physics and rapid initiation of high explosives due to its accurate time control, ultra-fast response and strong ability to resist electromagnetic interference [1]. As is shown in Fig. 1, a typical multi-layer flyer driven by pulsed laser is composed of three layers. Fig. 1. Structure of the multi-layer flyer. When a pulsed laser penetrates through the transparent substrate, absorption of laser energy will instantaneously occur inside the ablation layer which will be vaporized to generate plasma to drive the flyer out. The insulation layer can appropriately control the generation of plasma and prevent flyer layer from melting to ensure the integrity of flyer. J.L. Labaste [2] demonstrated performances of flyers were influenced by optical and thermodynamic properties of materials. Greenawa [3] found the addition of Al 2 O 3 layer between Al layers increased the flyer velocity by 30%. Stahl [4] proved the C layer between substrate and flyer improved its velocity by absorbing more laser energy. Hatt [5] found Mg as the material of ablation layer enhanced the velocity of flyer by 27% compared with Al. In general, studies of the regularities for velocity, impact morphology, impact stress and shock initiation properties of mainstream laser-driven flyers have not gone much