Microscopic characterization of laser-induced damage performance of large-size KDP and DKDP nonlinear crystals

P. DeMange, C. W. Carr, H. B. Radousky, S. G. Demos

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

12 Scopus citations

Abstract

KDP and DKDP are unique materials for frequency conversion in large-aperture laser systems. Under high power irradiation, a threshold exists above which multiple damage sites are formed in the bulk of crystal plates thus obstructing beam propagation and creating undesirable beam modulations. Damage testing has focused on measuring the irradiation threshold fluences that lead to irreversible material modifications. However, small amounts of damage in optical components have been determined not to hinder system performance in large-aperture laser systems. In this work, we present a new approach to evaluating damage performance that provides statistics on damage pinpoint density, size and morphology as a function of fluence, wavelength and pulse duration and relates that to the resulting beam obscuration. We measure the size of damage sites for different wavelengths, pulse-lengths, and fluences. Different pulse-lengths are approximated by using multiple pulses appropriately delayed with respect to each other. We find that in KDP/DKDP crystals, the size of damage sites strongly depend on the pulse-length, with longer pulses creating larger damage sites. Also examined are ways of laser-annealing to increase the damage resistance.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsK.L. Schepler, D.D. Lowenthal
Pages47-53
Number of pages7
Volume5337
DOIs
StatePublished - 2004
Externally publishedYes
EventNonlinear Frequency Generation and Conversion: Materials, Devices, and Applications III - San Jose, CA, United States
Duration: Jan 26 2004Jan 27 2004

Other

OtherNonlinear Frequency Generation and Conversion: Materials, Devices, and Applications III
CountryUnited States
CitySan Jose, CA
Period1/26/041/27/04

Keywords

  • Beam obscuration
  • Damage testing
  • Damage threshold
  • KDP
  • Laser conditioning

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

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  • Cite this

    DeMange, P., Carr, C. W., Radousky, H. B., & Demos, S. G. (2004). Microscopic characterization of laser-induced damage performance of large-size KDP and DKDP nonlinear crystals. In K. L. Schepler, & D. D. Lowenthal (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 5337, pp. 47-53) https://doi.org/10.1117/12.531330