Interactions of wide band-gap single crystals with 248 nm excimer laser radiation. I. MgO

Journal Article · Sun Aug 15 04:00:00 EDT 1993 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.354718· OSTI ID:6071613

Webb, R L; Jensen, L C; Langford, S C; Dickinson, J T ^[1]

---

1. Physics Department, Washington State University, Pullman, Washington 99164-2814 (United States)

The emission of charged and neutral particles from single-crystal MgO irradiated with pulsed 248 nm excimer laser light is studied by means of quadrupole mass spectrometry, time-resolved emission spectroscopy, luminescence spectroscopy, and scanning electron microscopy (SEM) observations. The role of the initial distribution of near-surface defects plus defects which result from repeated application of laser pulses is explored. This increase in defect density eventually leads to formation of a visible plume and rapid material vaporization. SEM observations after irradiation indicate that substantial surface fracture is present prior to the onset of rapid vaporization. Defect production during irradiation is attributed to mechanical processes involving deformation and fracture with accompanying dislocation motion. The accumulation of these defects increases laser absorption in the near-surface region resulting in rapid thermal etching and cluster emission.

• DOE Contract Number: FG06-92ER14252
• OSTI ID: 6071613
• Journal Information: Journal of Applied Physics; (United States), Journal Name: Journal of Applied Physics; (United States) Vol. 74:4; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360600 -- Other Materials
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700350* -- Plasma Production
Heating
Current Drive
& Interactions-- (1992-)
ABLATION
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
ELECTROMAGNETIC RADIATION
ELECTRON MICROSCOPY
EMISSION SPECTRA
LASER-PRODUCED PLASMA
LUMINESCENCE
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MICROSCOPY
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
PLASMA
PLASMA DIAGNOSTICS
RADIATIONS
SPECTRA
SURFACE PROPERTIES
ULTRAVIOLET RADIATION