Stoichiometric changes to KH 2PO 4 during laser-induced breakdown

R. A. Negres, S. O. Kucheyev, P. Demange, C. W. Carr, S. G. Demos

Research output: Chapter in Book/Report/Conference proceedingConference contribution

11 Scopus citations


The local structure of KH 2PO 4 crystals (so-called KDP) at laser-induced damage sites created by irradiation with ∼ 3-ns, 355-nm laser pulses is studied by a combination of Raman scattering and photoluminescence spectroscopies. We compare spectra from pristine material, surface and bulk laser-induced damage sites, as well as from KPO 3 references. Results show that irradiation with fluences above the laser-induced breakdown threshold leads to stoichiometric changes at surface damage sites but not at bulk damage sites. New spectroscopic features are attributed to dehydration products. For the laser irradiation conditions used in this study, the decomposed near-surface layer absorbs photons at ∼ 3.4 eV (364 nm). These results may help explain the recently reported observation that surface laser damage sites in KDP crystals tend to grow with subsequent exposure to high-power laser pulses, while bulk damage sites do not.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsG.J. Exarhos, A.H. Guenther, N. Kaiser, K.L. Lewis, M.J. Soileau, C.J. Stolz
Number of pages7
StatePublished - 2005
Externally publishedYes
Event36th Annual Boulder Damage Symposium Proceedings: Laser-Induced Damage in Optical Materials: 2004 - Boulder, CO, United States
Duration: Sep 20 2004Sep 22 2004


Other36th Annual Boulder Damage Symposium Proceedings: Laser-Induced Damage in Optical Materials: 2004
Country/TerritoryUnited States
CityBoulder, CO


  • Condensed phosphates
  • KDP and DKDP crystals
  • Laser-induced damage
  • Photoluminescence
  • Raman spectroscopy

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics


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