Coherent light generators – Particular beam control device – Control of pulse characteristics
Reexamination Certificate
2009-10-26
2011-12-20
Stultz, Jessica T (Department: 2828)
Coherent light generators
Particular beam control device
Control of pulse characteristics
C372S026000, C372S030000, C372S009000, C372S010000, C372S017000
Reexamination Certificate
active
08081668
ABSTRACT:
A laser processes a workpiece with laser pulses delivered at random time intervals and at substantially constant energy levels by characterizing the laser cavity discharge behavior and utilizing that information for adjusting dummy pulse time periods to compensate for the energy errors. Dummy pulses are laser pulses that are blocked from reaching a workpiece. A second way for providing constant pulse energies employs an AOM for varying amounts of laser energy passed to the workpiece. A third way of providing constant pulse energies entails extending the pulse period of selected pulses to allow additional laser cavity charging time whenever a dummy pulse is initiated.
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Grant Keith
Nilsen Brady
Stone Steve
Electro Scientific Industries Inc.
Fordé Delma R
Stoel Rives LLP
Stultz Jessica T
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