Semiconductor laser driver circuit

Details Semiconductor laser driver circuit Semiconductor laser driver circuit

Filed on

1986-11-20

Date issued

1989-04-04

Examiner

Sikes, William L.

Patent Class

Coherent light generators

SubClass

Particular component circuitry

SubSubClass

Optical pumping

Other Related Categories

372 25, 372 26, 372 28, 372 29, 372 33, 372 37, H01S 300, H01S 310

Type

Patent

Status

active

Patent number

048192422

Description

ABSTRACT:
A low-laser-noise semiconductor driver device is provided for use in an optical information processing device which is recordable or erasable and which oscillates a semiconductor laser with a high output when it is recorded or erased. A semiconductor is generally oscillated with a rated maximum output during a recording and erasing operation. Therefore, when high frequency superposition is made in such a high output oscillation state, an oscillation output exceeds the rated output, which badly influences the life of the laser. To obviate this drawback, the high frequency superposition is stopped at the mode of recording or erasing in which the high output oscillation is made by a switching circuit which is controlled by a mode control signal. This reduces the laser noise at the mode of reproducing and also lengthens the life of the semiconductor laser. The semiconductor laser driver device can be also used as a light source of the optical information processing device which can record and/or erase information.

REFERENCES:
patent: 4009385 (1977-02-01), Sell
patent: 4430739 (1984-02-01), McMahan
patent: 4480325 (1984-10-01), Aiki et al.
patent: 4532619 (1985-07-01), Sugiyama et al.
patent: 4546463 (1985-10-01), Opheij et al.
patent: 4679184 (1987-07-01), Yoshida et al.

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