Coherent light generators – Particular beam control device – Optical output stabilization
Patent
1992-11-02
1993-06-22
Davie, James W.
Coherent light generators
Particular beam control device
Optical output stabilization
H01S 313
Patent
active
052220729
ABSTRACT:
A laser power control apparatus which comprises an exciting section for supplying a drive current to a laser oscillation device, a laser power controller for generating current designating data which is incremented and decremented in a binary order, first and second digital/analog converters respectively assigned to lower digits and higher digits of the current designating data, for performing digital-to-analog conversion on the lower-digit data and the higher-digit data, a current setting section for setting a level for the drive current in accordance with the sum of output voltages of the first and second digital/analog converters. In the apparatus, the current setting section has circuit constants which cause the ranges of the drive current for sequential two values of the higher-digit data to be overlapped with each other by a predetermined amount, and the laser power controller has a circuit for limiting the range of the lower-digit data to compensate the overlap of the drive current ranges.
REFERENCES:
patent: 4856008 (1989-08-01), Senma et al.
patent: 5134623 (1992-07-01), Egawa et al.
Patent Abstract of Japan, vol. 14, No. 248, May 28, 1990 Laser Light Quantity Control Device.
Davie James W.
Tokyo Electric Co. Ltd.
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