System to control the power of a beam

Details System to control the power of a beam System to control the power of a beam

1998-09-18

2000-07-18

Larkin, Daniel S.

Measuring and testing

Gas analysis

By vibration

73 2402, 73 405A, 73 407, 25033901, 25033906, 25033912, 2503393, 250343, 356432, 356437, G01J 502, G01M 316

Patent

active

060890762

ABSTRACT:
The present invention is a system for controlling the power level of a beam exiting an acousto-optic cell and/or a beam delivery device. A beam detector senses the power level of the beam and produces a power signal indicative thereof. An error detector compares the power signal to a predetermined power level. If the power signal and predetermined power level differ, the error amplifier emits a correction signal to a variable amplitude source, which adjusts the amplitude of the acoustic drive frequency such that the power level of the beam exiting the acousto-optic cell and/or the beam delivery device is substantially equal to the predetermined power level.

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