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.
Original language | English (US) |
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Title of host publication | Proceedings of SPIE - The International Society for Optical Engineering |
Editors | G.J. Exarhos, A.H. Guenter, K.L. Lewis, M.J. Soileau, C.J. Stolz |
Pages | 257-270 |
Number of pages | 14 |
Volume | 4679 |
DOIs | |
State | Published - 2002 |
Externally published | Yes |
Event | Laser-Induced Damage in Optical Materials: 2001 - Boulder, CO, United States Duration: Oct 1 2001 → Oct 2 2001 |
Other
Other | Laser-Induced Damage in Optical Materials: 2001 |
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Country | United States |
City | Boulder, CO |
Period | 10/1/01 → 10/2/01 |
Keywords
- Fluorescence
- KDP
- Laser damage
- Photoemission
- Photoluminescence
- Potassium dihydrogen phosphate
- Surface roughening
- Vacuum
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Condensed Matter Physics