Laser control circuit

Details Laser control circuit Laser control circuit

1987-04-10

1989-01-03

Sikes, William L.

Coherent light generators

Particular component circuitry

Optical pumping

372 31, 369116, H01S 300

Patent

active

047962674

ABSTRACT:
Disclosed is a laser control circuit used for an optical disc player. The laser output is digitally modulated, when recording to have high and low levels. The invention provides the laser control circuit capable of controlling the high level and the low level. The circuit is provided with a negative feedback loop in order to stabilize the laser output. Although such negative feedback loop stabilizes the average level of the laser output, the high and low levels may be fluctuated sometimes thereby. The invention also provides for supressing such level fluctuation.

REFERENCES:
patent: 4093961 (1978-06-01), Kanamaru
patent: 4114180 (1978-09-01), Kayanuma
patent: 4283785 (1981-08-01), Miyauchi et al.
patent: 4554654 (1985-11-01), Kato
patent: 4701609 (1987-10-01), Koishi et al.
patent: 4709417 (1987-11-01), Kuwabara

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