He-Ne laser driving power supply with means for interrupting fee

Details He-Ne laser driving power supply with means for interrupting fee He-Ne laser driving power supply with means for interrupting fee

1993-03-09

1995-06-27

Pascal, Robert J.

Coherent light generators

Particular component circuitry

Optical pumping

315225, 315307, 315219, H01S 300

Patent

active

054286336

ABSTRACT:
An electronic circuit is provided to improve the performance of a conventional power supply for driving a He-Ne laser. In order to avoid an undershoot of the DC current due to operation of the feedback circuit at driving start of the laser, a feedback interrupting circuit is provided in the power supply which compares a detected voltage with a first reference voltage smaller than a predetermined voltage to produce a resultant voltage when the detected voltage is larger than the first reference voltage. The resultant voltage is charged at a charging circuit with a charging time constant to produce a charged voltage. The charged voltage is compared with a second reference voltage having a predetermined voltage level, and the feedback circuit is prevented from producing the control signal during the time interval when the charged voltage is smaller than the second reference voltage.

REFERENCES:
patent: 4716569 (1987-12-01), Bees
patent: 4884280 (1989-11-01), Kinoshita
patent: 5048033 (1991-09-01), Donahue
patent: 5150372 (1992-09-01), Nourrcier

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