Laser apparatus and method employing digital filter controlled p

Coherent light generators – Particular beam control device – Control of pulse characteristics

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372 30, 372 38, 372 75, H01S 310

Patent

active

053032489

ABSTRACT:
A laser apparatus or system is provided including a driving mechanism for driving a pulsed semiconductor laser which injects optical energy into a lasing medium. A digital filter is employed to adjust the time duration or pulse width of drive pulses which excite the semiconductor laser. In this manner, the irradiation of the lasing medium is adjusted by pulse width modulation of the driving current in the semiconductor laser. The laser apparatus employs a sampled output, digitally filtered, negative feedback signal to drive the semiconductor laser. This structure has the effect of making the semiconductor laser responsive to changes in the laser system or to undesired degradation in the laser system. The laser apparatus compensates for the inherent time lag in laser output power energy during initial startup of the laser.

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patent: 4888777 (1989-12-01), Takeyama
patent: 4998257 (1991-03-01), On et al.
patent: 5140603 (1992-08-01), Anderson, Jr. et al.
patent: 5144631 (1992-09-01), Okino
patent: 5157675 (1992-10-01), Takagi
patent: 5226051 (1993-07-01), Chan et al.

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