Modeling the material properties at the onset of damage initiation in bulk potassium dihydrogen phosphate crystals

Stavros G. Demos, Michael D. Feit, Guillaume Duchateau

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

1 Scopus citations

Abstract

A model simulating transient optical properties during laser damage in the bulk of KDP/DKDP crystals is presented. The model was developed and tested using as a benchmark its ability to reproduce the well-documented damage initiation behaviors but most importantly, the salient behavior of the wavelength dependence of the damage threshold. The model involves two phases. During phase I, the model assumes a moderate localized initial absorption that is strongly enhanced during the laser pulse via excited state absorption and thermally driven generation of additional point defects in the surrounding material. The model suggests that during a fraction of the pulse duration, the host material around the defect cluster is transformed into a strong absorber that leads to significant increase of the local temperature. During phase II, the model suggests that the excitation pathway consists mainly of one photon absorption events within a quasicontinuum of short-lived vibronic defect states spanning the band gap that was generated after the initial localized heating of the material due to thermal quenching of the excited state lifetimes. The width of the transition (steps) between different number of photons is governed by the instantaneous temperature, which was estimated using the experimental data. The model also suggests that the critical physical parameter prior to initiation of breakdown is the conduction band electron density. This model, employing very few free parameters, for the first time is able to quantitatively reproduce the wavelength dependence of the damage initiation threshold, and thus provides important insight into the physical processes involved.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSPIE
Volume9237
ISBN (Print)9781628413007
DOIs
StatePublished - 2014
Externally publishedYes
Event46th Annual Laser Damage Symposium - Laser-Induced Damage in Optical Materials: 2014 - Boulder, United States
Duration: Sep 14 2014Sep 17 2014

Other

Other46th Annual Laser Damage Symposium - Laser-Induced Damage in Optical Materials: 2014
CountryUnited States
CityBoulder
Period9/14/149/17/14

Keywords

  • DKDP
  • KDP
  • Laser-induced damage
  • Theoretical modeling laser damage

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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  • Cite this

    Demos, S. G., Feit, M. D., & Duchateau, G. (2014). Modeling the material properties at the onset of damage initiation in bulk potassium dihydrogen phosphate crystals. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 9237). [92370W] SPIE. https://doi.org/10.1117/12.2069673