The time evolution process of the plasma generated by laser pulse interaction with solid target in air is observed by optical shadowgraph imaging technique. The ablation pressure of the shock wave generated with the plasma is calculated analytically. It is found that plasma expansion in perpendicular and lateral directions are both proportional to t2/5 with t as delay time, and the ablation pressure...
Compared with direct ablation, a prepulse is used to enhance the coupling coefficient in laser plasma propulsion. It is found that the coupling coefficient is related with the delay times between the main beam and the prepulse. At a delay time of 12 ns, the coupling coefficient reaches the maximum of 5.8 × 10−5 N/W.
Financed by the National Centre for Research and Development under grant No. SP/I/1/77065/10 by the strategic scientific research and experimental development program:
SYNAT - “Interdisciplinary System for Interactive Scientific and Scientific-Technical Information”.