Direct imaging of the fragments produced during excimer laser ablation of YBa sub 2 Cu sub 3 O sub 7 minus. delta
- IBM Thomas J. Watson Research Center, Yorktown Heights, New York (USA)
The evolution dynamics of the fragments produced during KrF excimer laser (248 nm, 25 ns) ablation of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} has been observed by ultrafast photography using a synchronized dye laser beam ({similar to}1 ns) to probe above the target surface. The images show that fragment removal is initiated near the beginning of the laser pulse ({gt}10 ns), continues for a maximum of a few hundred nanoseconds, and has an expansion front velocity suggesting a target temperature varying from about 1500 to 4000 K or greater. The shock wave formed due to interaction of the ablated fragments with background oxygen gas has also been photographed, and its temporal evolution as a function of oxygen pressure has been shown to agree better with a planar than spherical model. The overall picture is that of an ablation process showing pronounced but understandable gas-dynamic effects.
- OSTI ID:
- 5278790
- Journal Information:
- Applied Physics Letters; (United States), Journal Name: Applied Physics Letters; (United States) Vol. 59:11; ISSN APPLA; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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Evolution and dynamics of excimer laser vaporized YBa[sub 2]Cu[sub 3]O[sub 7-[delta]] plumes
Evolution and dynamics of excimer laser vaporized YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} plumes
Related Subjects
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ABLATION
ALKALINE EARTH METAL COMPOUNDS
AMINES
AMMONIUM COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTROMAGNETIC RADIATION
HIGH-TC SUPERCONDUCTORS
LASER RADIATION
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOGRAPHY
QUATERNARY COMPOUNDS
RADIATIONS
RESOLUTION
SHOCK WAVES
SUPERCONDUCTORS
TIME RESOLUTION
TIMING PROPERTIES
TRANSITION ELEMENT COMPOUNDS
ULTRAHIGH TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES