Experiment study on technologies for laser-driven flyer hypervelocity launch

The paper introduces the factors that influence the technologies for laser-driven flyer hypervelocity launch, and studies the effects of laser energy, spatial distribution of laser beam and deposition techniques of coatings on the velocity and integrity of flyers. The results indicate that the spatially “flat cap” laser beam can launch flyers of good integrity. Adding a Cr film between Al coating and substrate can enhance the adhesion between them, and also enhance the flyer velocity distinctly. With a laser of 1 064 nm wavelength and 10 ns pulse duration at laser energy of 835 mJ, the flyer driven out can reach a velocity of 10.4 km/s, whose thickness is 5 μm and diameter is 1 mm.