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Proceedings Paper

Performance of bare and sol-gel-coated DKDP crystal surfaces exposed to multiple 351-nm laser pulses in vacuum and air
Author(s): Pamela K. Whitman; Mary A. Norton; Mike C. Nostrand; William A. Molander; A. Nelson; M. Engelhard; D Gaspar; D. Baer; Wigbert J. Siekhaus; J. Auerbach; Stavros G. Demos; Michael C Staggs; Alan K. Burnham
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Paper Abstract

We have investigated the surface degradation of bare and sol-gel coated deuterated potassium dihydrogen phosphate (DKDP) crystals when exposed to 351-nm laser pulses in atmospheric air and nitrogen and at pressures ranging from atmospheric down to 10-5 Torr vacuum. Optical microscopy, surface topography, surface chemical analyses, 351-nm pumped photoemission maps, and photometry results have been used to characterize these samples. We report the occurrence of two potentially linked surface degradation phenomena: the development of increased photoemission and the development of unacceptable surface roughening in the region exposed to the beam in vacuum. We note no degradation for surfaces exposed in air or nitrogen at pressures exceeding 1 Torr. Diamond-turned DKDP surfaces show a ubiquitous, low-intensity photoemission signature before exposure to any laser fluence. The observed reduction of this emission signal as a function of operating pressure and accumulated laser energy when crystals are exposed to 351-nm laser pulses in air can be correlated with the removal of surface carbon.

Paper Details

Date Published: 9 April 2002
PDF: 14 pages
Proc. SPIE 4679, Laser-Induced Damage in Optical Materials: 2001, (9 April 2002); doi: 10.1117/12.461721
Show Author Affiliations
Pamela K. Whitman, Lawrence Livermore National Lab. (United States)
Mary A. Norton, Lawrence Livermore National Lab. (United States)
Mike C. Nostrand, Lawrence Livermore National Lab. (United States)
William A. Molander, Lawrence Livermore National Lab. (United States)
A. Nelson, Lawrence Livermore National Lab. (United States)
M. Engelhard, PNNL Environmental Molecular Sciences Lab. (United States)
D Gaspar, PNNL Environmental Molecular Sciences Lab. (United States)
D. Baer, PNNL Environmental Molecular Sciences Lab. (United States)
Wigbert J. Siekhaus, Lawrence Livermore National Lab. (United States)
J. Auerbach, Lawrence Livermore National Lab. (United States)
Stavros G. Demos, Lawrence Livermore National Lab. (United States)
Michael C Staggs, Lawrence Livermore National Lab. (United States)
Alan K. Burnham, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 4679:
Laser-Induced Damage in Optical Materials: 2001
Gregory J. Exarhos; Arthur H. Guenther; Keith L. Lewis; M. J. Soileau; Christopher J. Stolz, Editor(s)

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