Share Email Print
cover

Proceedings Paper

Modeling of laser-induced damage in KDP crystals by nanosecond pulses: a preliminary hydrodynamic study
Author(s): G. Duchateau; D. Hébert; L. Hallo
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

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.

Paper Details

Date Published: 29 November 2010
PDF: 10 pages
Proc. SPIE 7842, Laser-Induced Damage in Optical Materials: 2010, 78420S (29 November 2010); doi: 10.1117/12.867254
Show Author Affiliations
G. Duchateau, Commissariat à l'Énergie Atomique (France)
D. Hébert, Commissariat à l'Énergie Atomique (France)
L. Hallo, CELIA, CNRS, Univ. Bordeaux 1 (France)


Published in SPIE Proceedings Vol. 7842:
Laser-Induced Damage in Optical Materials: 2010
Gregory J. Exarhos; Vitaly E. Gruzdev; Joseph A. Menapace; Detlev Ristau; M. J. Soileau, Editor(s)

© SPIE. Terms of Use
Back to Top