Effect of a simple double-confined structure on nanosecond pulse ablative laser propulsionLei Shi, Shang-Hong Zhao, Xing-Chun Chu, Li-Hua Ma, Ji-Li Wu, Xiao-Liang Li and Yong-Jun Li
Institute of Telecommunication Engineering, Air Force Engineering University - Xi'an 710077, China
received 21 January 2009; accepted in final form 17 February 2009; published March 2009
published online 9 March 2009
We succeeded in obtaining propulsion of an aluminum bullet by a gigawatt nanosecond pulse Nd:glass laser, in which we demonstrated the effectiveness of a simple double-confined structure that consists of a thin black-paint coat covered with a glass board as a transparent overlay. The black-paint coat not only serves as a substitute for the target to be ablated, but also improves the absorbency of the incident laser energy. Another main feature of this structure is that it can lead to the enhancement of the coupling coefficient due to plasma confinement and impedance mismatch. Adopting this simple double-confined structure, a coupling coefficient up to 160 dyne/W was achieved, which was enhanced by about 20 times with respect to direct ablation.
52.75.Di - Ion and plasma propulsion.
79.20.Ds - Laser-beam impact phenomena.
52.58.-c - Other confinement methods.
© EPLA 2009