Stoichiometric changes to KH2PO4 during laser-induced breakdown

Raluca A. Negres; Sergei O. Kucheyev; Paul P. DeMange; Christopher Wren Carr; Stavros G. Demos

doi:10.1117/12.584943

21 February 2005 Stoichiometric changes to KH₂PO₄ during laser-induced breakdown

Raluca A. Negres, Sergei O. Kucheyev, Paul P. DeMange, Christopher Wren Carr, Stavros G. Demos

Proceedings Volume 5647, Laser-Induced Damage in Optical Materials: 2004; (2005) https://doi.org/10.1117/12.584943
Event: Boulder Damage Symposium XXXVI, 2004, Boulder, Colorado, United States

Abstract

The local structure of KH2PO4 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 KPO3 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.

Citation Download Citation

Raluca A. Negres, Sergei O. Kucheyev, Paul P. DeMange, Christopher Wren Carr, and Stavros G. Demos "Stoichiometric changes to KH₂PO₄ during laser-induced breakdown", Proc. SPIE 5647, Laser-Induced Damage in Optical Materials: 2004, (21 February 2005); https://doi.org/10.1117/12.584943

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