Coherent light generators – Particular beam control device
Patent
1987-09-16
1989-08-29
Sikes, William L.
Coherent light generators
Particular beam control device
372 33, 372 38, H01S 310
Patent
active
048624667
ABSTRACT:
A laser emitting apparatus comprising a semiconductor laser and drive unit for applying an excitation current to the semiconductor laser to cause the semiconductor laser to emit a laser beam. A photoreceptor accepts the laser beam and outputs a signal corresponding to the intensity of the laser beam. A first control unit is provided which is operable in response to the signal output from the photoreceptor for controlling the excitation current in order to maintain the laser beam at a predetermined intensity. The apparatus further comprises a unit for outputting an interrupt signal for interrupting the emission of the laser beam, and a second control means unit operable in response to the interrupt signal for reducing the excitation current below a predetermined intensity level regardless of controls effected by the first control unit.
REFERENCES:
patent: 4618958 (1986-10-01), Shibata et al.
patent: 4713672 (1987-12-01), Horihata et al.
patent: 4748633 (1988-05-01), Negishi
patent: 4763334 (1988-08-01), Shimada et al.
Holloway B. R. R.
Minolta Camera Kabushiki Kaisha
Sikes William L.
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