Optical: systems and elements – Optical modulator – Light wave directional modulation
Reexamination Certificate
2006-11-07
2006-11-07
Spector, David N. (Department: 2873)
Optical: systems and elements
Optical modulator
Light wave directional modulation
C359S305000, C359S307000, C219S121780, C219S121600, C219S121610
Reexamination Certificate
active
07133188
ABSTRACT:
Digital control of frequency and/or amplitude modulation techniques of an intracavity and/or extracavity AOM (60) facilitate substantially full extinction of a laser beam (90) to prevent unwanted laser energy from impinging a workpiece (80); facilitate laser pulse amplitude stability through closed-loop control of pulse-to-pulse laser energy; facilitate beam-positioning control including, but not limited to, closed-loop control for applications such as alignment error correction, beam walk rectification, or tertiary positioning; and facilitate employment of more than one transducer on an AOM (60) to perform any of the above-listed applications.
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Electro Scientific Industries Inc.
Spector David N.
Stoel Rives LLP
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