High energy pulse suppression method

Details High energy pulse suppression method High energy pulse suppression method

2004-11-24

2009-11-10

Harvey, Minsun (Department: 2828)

Coherent light generators

Particular beam control device

Q-switch

C372S090000, C372S026000, C372S092000

Reexamination Certificate

active

07616669

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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