2005/06/03 by P. P. Rajeev, Rajeev, P. P., S. Kahaly +15
Engineering · Physics and Astronomy · #FOS: Physical sciences #Laser-Ablation Synthesis of Nanoparticles #Laser-Matter Interactions and Applications #Laser-induced spectroscopy and plasma #Optics (physics.optics) #Plasma Physics (physics.plasm-ph) #physics.optics #physics.plasm-ph
paper · pdf · doi:10.48550/arxiv.physics/0506031
5 pages, 4 figures, submitted to Phys. Rev. A (rapid comm.)
arxiv created 2005/06/03 · openalex publication_date 2005/06/03 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Hard x-ray emission (20 - 200 keV) from plasmas produced by intense laser pulses on nanoparticle coated targets is compared with that from optically polished targets. The yield enhancement offered by nanoparticles is studied under different prepulse conditions. It is observed that the enhancement reduces when the nanoparticle coated target is irradiated with a prepulse with intensity greater than 1013 W/cm2. When the prepulse intensity exceeds 1014 W/cm2, the enhancement vanishes completely. This is attributed to preplasma formation on nanoparticles their subsequent structural modifcation before the arrival of the main pulse. It is suggested that high-contrast ultrashort pulses are essential for nanoparticles to function as yield enhancers.