Adaptive laser diode driver circuit for laser scanners

Details Adaptive laser diode driver circuit for laser scanners Adaptive laser diode driver circuit for laser scanners

1989-09-18

1991-02-19

Scott, Jr., Leon

Coherent light generators

Particular component circuitry

Optical pumping

372 29, 372 24, 372 26, H01S 313

Patent

active

049951050

ABSTRACT:
A circuit used in laser scanners which allows the continuous calibration of a laser so that the output power of the laser is accurately modulated by the input video signal regardless of temperature changes or aging effects of the laser. The video signal includes a test segment which has two steps. The light output of the laser is measured during both steps. The lower step measurement is compared to a reference and the error is used to adjust the bias current of the laser. The difference between the upper step measurement and the lower step measurement is compared to a second reference and the error is used to adjust the gain of the video signal so that the variation in laser power maximum and minimum remains calibrated.

REFERENCES:
patent: 4577320 (1986-03-01), Yoshikawa et al.
patent: 4698817 (1987-10-01), Burley
patent: 4796266 (1989-01-01), Banwell et al.
patent: 4813034 (1989-03-01), Mashimo

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