Coherent light generators – Particular beam control device – Optical output stabilization
Patent
1990-09-04
1991-06-18
Davie, James W.
Coherent light generators
Particular beam control device
Optical output stabilization
372 29, H01S 310
Patent
active
050254472
ABSTRACT:
A semiconductor laser drive circuit comprises a control circuit, an addition circuit, a conversion drive circuit, and an optical output determination circuit. The control circuit starts the control operation upon receiving a control command from the exterior. First, the control circuit sends a control signal at the median of a predetermined control range. Second, the control circuit determines if an optical output of the semiconductor laser corresponding to the median control signal is greater than or equal to the predetermined value. Third, based upon the determination result, it is determined whether the greater half or the lesser half of the control range is searched. Then, the control signal at the median of the determined half of the initial control range is sent and the corresponding optical output is generated for searching thereof. A predetermined number of such binary-tree search operations are carried out and the median of the last-searched control range is determined as a desired control signal.
REFERENCES:
patent: 4733398 (1988-03-01), Shibagaki et al.
patent: 4928284 (1990-05-01), Burns
Brother Kogyo Kabushiki Kaisha
Davie James W.
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