Semiconductor laser drive device

Details Semiconductor laser drive device Semiconductor laser drive device

1991-01-18

1992-09-01

Epps, Georgia Y.

Coherent light generators

Particular beam control device

Control of pulse characteristics

372 26, 372 38, H01S 310

Patent

active

051446316

ABSTRACT:
A semiconductor laser drive device includes a pulse-width modulation circuit for producing a pulse-width-modulated signal having a first number of gradations in response to a first image signal, and a pulse-amplitude modulation circuit for producing a pulse-amplitude-modulated signal having a second number of gradations in response to a second image signal, the pulse-amplitude-modulated signal having an amplitude of zero when the semiconductor laser radiates no emission and having an amplitude for maintaining a predetermined emission mode from the semiconductor laser when the semiconductor laser radiates the emission. The semiconductor laser is supplied with a signal having a number of gradations determined by a combination of the pulse-width-modulated signal and the pulse-amplitude-modulated signal.

REFERENCES:
patent: 4601037 (1986-07-01), McDonald
patent: 4679057 (1987-07-01), Hamada
patent: 5029108 (1991-07-01), Lung

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