Stabilized laser apparatus

Details Stabilized laser apparatus Stabilized laser apparatus

1986-03-03

1988-03-29

LaRoche, Eugene R.

Coherent light generators

Particular operating compensation means

372 26, 372 29, 372 31, 372 38, 250205, 455613, 455618, H01S 300, H01S 304, G01J 132, G02F 100

Patent

active

047349140

ABSTRACT:
A stabilized laser apparatus includes a semiconductor laser, a photodetector for detecting an output laser beam from the semiconductor laser, a differential amplifier for comparing the laser detection signal with a first or second reference signal, a window comparator for comparing a threshold range with an output from the differential amplifier, an up/down counter operated in response to an output from the window comparator, and a driving circuit for supplying a drive current to the semiconductor laser in accordance with a count of the up/down counter. A servo loop from the photodetector to the up/down counter is operated in response to an operation instruction signal or an adjustment instruction signal. The drive current is adjusted to coincide with a reference value before operation, and the adjusted drive current is stored in the up/down counter.

REFERENCES:
patent: 3360650 (1967-12-01), Lawrence
patent: 3949226 (1976-04-01), Dugan et al.
patent: 4097732 (1978-06-01), Krause et al.
patent: 4592057 (1986-05-01), Comerford

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