Dynamics of Clusters Under Intense Laser Irradiation

摘要

We report an experimental study on the X-ray emission from aluminum clusters (diameter ～0.4 μm), carbon (diameter.～ 0.5 μm) and gold (diameter. ～1.25 μm). They were ingrained in a polymer and irradiated with 1.06 μm laser, 10 ns (FWHM) at an intensity ～10~(12) W/cm~2. Aluminum and carbon clusters show a different spectra compared to their respective bulk material whereas gold clusters evolve towards bulk gold. Experimental data are analyzed on the basis of cluster dimension, laser wavelength and pulse duration. PIC simulations are performed to study the behavior of clusters at higher intensity I ≥ 10~(17) W/cm~2 for different size of the clusters irradiated at different laser wavelengths. Results indicate the dependence of cluster dynamics on cluster size and incident laser wavelength.