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AssigneeJerry Ehrenwald
InventorsJerry Ehrenwald, Carl B. Miller, Jr.
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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.
A laser apparatus for inscribing permanent markings selectively on or below a target surface comprising a source of coherent electromagnetic radiation in a continuous mode having a fundamental radiation frequency, resonator means including an optical cavity, switch means for transmitting short duration pulses of said radiation from the cavity, fixed focus optical means including short focal length objective lens means for directing the transmitted radiation to a focussed spot at the target surface, conversion means within the optical cavity for modifying the radiation wave length to conform with the focal length of the lens means, said conversion means including a harmonic crystal generator providing a multiple harmonic of the fundamental radiation frequency with the converted wave length being compatibly focusable by the lens means for providing a shallow penetration depth in the target surface.
A method for laser engraving permanent identification markings in the structure of a diamond including the steps of
Dependencies are inferred from the claim text.