Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1992-08-24
1993-08-03
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
369116, G01J 132, G11B 700
Patent
active
052331750
ABSTRACT:
An optoelectronic system for controlling laser drive current to produce a power level at the target independent of changes in the transmissivity of a beamsplitter positioned in the optical path between the laser source and the target. A second beamsplitter with transmissivity and reflectivity factors matched to the first beamsplitter is used to direct portions of light to two photodetectors. The two photodetectors are connected to circuits which produce a signal proportional to the power transmitted by the first beamsplitter divided by the power reflected by the second beamsplitter, that quotient multiplied by the sum of the photodetector signals to produce a final detection signal which is used as input to the servo control of laser drive current.
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Gardner Timothy S.
Latta Milton R.
International Business Machines - Corporation
Messinger Michael
Nelms David C.
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