Laser diode power controller

Details Laser diode power controller Laser diode power controller

1985-07-22

1987-08-04

Buczinski, Stephen C.

Coherent light generators

Particular beam control device

Having particular beam control circuit component

372 38, 372 50, 372 31, 357 19, H01S 313, H01S 319, H01L 3112

Patent

active

H00003220

ABSTRACT:
A laser diode power supply that uses a proportional controller that drives series pass transistor to regulate laser diode current and the intensity of the laser diode output. The purpose of the controller is to maintain constant laser output power when its unregulated output power would otherwise gradually decrease with age. The laser diode includes a detector that samples light emitted from the laser diode. The output of the detector is amplified and compared to a reference voltage in an integrator. The output of the integrator controls a series pass transistor that varies to power to the laser diode to provide a constant laser diode power output. The controller also includes power limiting and transient voltage protection circuits.

REFERENCES:
patent: 4305047 (1981-12-01), Chapman et al.

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