20 September 2004 Plasma block acceleration by ps-TW laser irradiation
Author Affiliations +
Proceedings Volume 5448, High-Power Laser Ablation V; (2004) https://doi.org/10.1117/12.546798
Event: High-Power Laser Ablation, 2004, Taos, New Mexico, United States
Plasma emission or ablation from laser-irradiated targets shows very complicated properties. One novelty was observed at irradiation of neodymium glass laser pulses of ps duration and TW power if there was a very strong suppression of prepulses by a contrast ratio of about 108 until 100 ps before the main pulse arrived. The emitted ion maximum energy was more than 50 times below the values observed in all the comparable numerous experiments. The other anomaly is that the number of the fast ions did not change when the laser intensity varied by a factor 30. This permitted a separation of the usual effects of self-focusing and permitted an analysis fully based on simplified plane geometry as a skin layer interaction mechanism. The consequence is that plasma blocks are accelerated by the nonlinear (ponderomotive) force with ion current densities above 1010 A/cm2. This provides basically new aspects for laser fusion using uncompressed solid DT fuel and a new kind of x-ray laser process may be possible.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
George H. Miley, George H. Miley, Frederick Osman, Frederick Osman, Heinrich Hora, Heinrich Hora, Jan Badziak, Jan Badziak, Karel Rohlena, Karel Rohlena, Karel Jungwirth, Karel Jungwirth, Jerzy Wolowski, Jerzy Wolowski, Y. Cang, Y. Cang, X. He, X. He, Jie Zhang, Jie Zhang, Peter X. Hammerling, Peter X. Hammerling, "Plasma block acceleration by ps-TW laser irradiation", Proc. SPIE 5448, High-Power Laser Ablation V, (20 September 2004); doi: 10.1117/12.546798; https://doi.org/10.1117/12.546798


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