Laser damage studies of ZnS via neutral Zn particle emission
- Argonne National Laboratory, Argonne, Illinois 60439 (US)
- Lawrence Livermore National Laboratory, Livermore, California (USA)
Emission of neutral atoms from ZnS surfaces due to laser irradiation has been observed at power densities two orders of magnitude below the single pulse damage threshold of the material. We have measured the velocity distribution and absolute yield of neutral Zn atoms generated by exposure of ZnS single crystals to XeCl excimer laser irradiation (308 nm) using time-of-flight and high-resolution two-photon laser-induced fluorescence spectroscpy. The distributions are in agreement with Maxwell-Boltzmann distributions. The characteristic temperature increases from 2000 to 9000 K as the fluences are raised from 17 to 80 mJ/cm{sup 2}, respectively. The absolute Zn yield also increased from 10{sup 8} to 10{sup 12} atoms per laser pulse as the laser fluence is increased. The insults suggest formation of a plasma that interacts with the surface and leads to catastrophic failure. For consecutive laser shots at constant lasers fluences, a nearly exponential increase in the Zn particle density is observed, yet visible damage did not occur until 150,000 laser shots. Our results show that neutral particle emission is of considerable importance in the identification of fundamental damage mechanisms and that microscopic damage occurs far below the single-pulse damage threshold.
- DOE Contract Number:
- W-31-109-ENG-38; W-7405-ENG-48
- OSTI ID:
- 6860483
- Report Number(s):
- CONF-8810399-; CODEN: APCPC; TRN: 90-015611
- Journal Information:
- AIP Conference Proceedings (American Institute of Physics); (USA), Vol. 191:1; Conference: 4. international laser science conference, Atlanta, GA (USA), 2-6 Oct 1988; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ZINC SULFIDES
PHYSICAL RADIATION EFFECTS
DAMAGE
EXCIMER LASERS
LASER RADIATION
SURFACE PROPERTIES
VERY HIGH TEMPERATURE
CHALCOGENIDES
ELECTROMAGNETIC RADIATION
GAS LASERS
INORGANIC PHOSPHORS
LASERS
PHOSPHORS
RADIATION EFFECTS
RADIATIONS
SULFIDES
SULFUR COMPOUNDS
ZINC COMPOUNDS
360605* - Materials- Radiation Effects