Abstract:
The spatial non-uniformities in the hydrodynamic parameters of an expanding plasma in laser-cluster interaction plays an important role in determining the region of resonance absorption. It is shown that, in the case of uniform density, the surface resonance at three times the critical density is responsible for laser absorption. However, it is volume resonance at critical density responsible for the laser absorption, if the non-uniform nature of plasma density inside the hydrodynamically expanding cluster is taken into account (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)