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US 3,940,289 AGranted
Flash melting method for producing new impurity distributions in solids
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsCharles L. Marquardt, John F. Giuliani
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Abstract
An impurity concentration profile is established in a solid by attaching solid to a heat sink and irradiating it with one or more fast laser pulses. The impurity may initially be located in a surface layer or it may be dispersed throughout the solid.
Claims7
A method of establishing an impurity concentration profile in a solid which comprises:
- placing a solid with an impurity which has a segregation coefficient different from 1 by a factor greater than about 3 in an inert atmosphere;
- attaching said solid to a heat sink;
- flash melting said solid by a laser pulse with a duration from 1/10 to 1/1000 .tau. and an energy area density from E to 1 1/5E;
- and
- allowing said solid to resolidify, thereby causing a freezing interface to pass through said solid.
2 more elements
Dependencies are inferred from the claim text.