The aim of this preliminary study is to provide a simple model for estimating the laser-induced damage formation
in potassium dihydrogen phosphate crystals (KH2PO4 or KDP) irradiated by nanosecond laser pulses operating
at 351nm. In our modelling approach, a damaged site is assumed to be induced from a nanometric existing defect,
i.e. a precursor defect. It makes it possible to absorb an important part of the incident laser energy which results
in a damage formation by some processes which combine heating and hydrodynamic processes. In our model,
the main expected features of the damage scenario are accounted for: the defect-assisted laser absorption and
subsequent plasma formation and evolution, the plasma absorption, heat transfer and hydrodynamic processes
via a simple Equation Of State (EOS). In these calculations, a crystal zone is assumed to damage since it
undergoes high enough density variations. Calculations shows that a nanometric precursor defect can effectively
lead to damaged site of several tens of micrometers in size as observed experimentally. Also, we demonstrate
the reliability of the long-standing assumption regarding the precursor defect size. Furthermore, a particular
morphology of the damaged site exhibiting various regions is obtained. These estimates have now to be confirmed
especially by improving the EOS and by introducing an elasto-plastic behavior.
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