Method and apparatus for laser engraving diamonds with permanent identification markings
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United States of America Patent
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Aug 21, 1984
Issued Date -
N/A
app pub date -
Jan 3, 1983
filing date -
Jan 3, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A laser system for inscribing permanent identification markings on or below the surface of a diamond. A shallow penetration depth and narrow line width is achieved by using a harmonic conversion device to produce an output frequency which is the second harmonic of the fundamental laser frequency in combination with a lens system having a short focal length to provide a high density pinpoint spot of laser energy. The energy intensity can be further regulated by a polarization attenuator. In operation, the diamond is mounted on a movable support structure which insures proper relationship to the laser beam. The process is activated by a computer which supplies positional commands to the movable support and is interfaced with the laser for generating programmed alpha-numeric sequences.
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