High voltage fast pulse control for a Q-switched laser

Coherent light generators – Particular beam control device – Q-switch

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372 12, 372 25, 372 38, H01S 311

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053434838

ABSTRACT:
A laser system having a laser rod, flash lamp, and a Q-switch including an electro-optical cell, is operated to provide double laser output pulses closely spaced from each other, e.g., within 5 microseconds. Two Q-switch drivers are provided with independent high voltage power supplies which can provide different high voltages to the two Q-switches. The outputs of the Q-switches are provided to an interface circuit which includes back-to-back diodes connected to a node which is connected to the output provided to the electro-optical cell. A control signal is provided to the first Q-switch driver after the flash lamp has been fired to provide a first pulse to the electro-optical cell to provide a pulse of light from the laser. A selected period of time thereafter, a control signal is provided to the second Q-switch driver to provide an output pulse through the interface circuit to the electro-optical cell to provide the second light pulse from the laser. The interface circuit prevents voltage pulses from one Q-switch driver to be conducted to the other Q-switch driver. Substantially equal output light pulses may be obtained from the laser by adjusting the voltage level of the high voltages applied to the two Q-switch drivers.

REFERENCES:
patent: 3571744 (1971-03-01), Hook et al.
patent: 3577097 (1971-05-01), Hilberg
patent: 3673504 (1972-06-01), Hilberg
patent: 3694769 (1972-09-01), Hook et al.
patent: 3783403 (1974-01-01), Hook et al.
patent: 4483614 (1984-11-01), Rogers
patent: 4552455 (1985-11-01), Johansson et al.
patent: 4675872 (1987-06-01), Popek et al.
patent: 4896119 (1990-01-01), Williamson et al.
patent: 5016251 (1991-05-01), D'Arcy
"Driving Method for Q-switching Laser Device", Patent Abstract of Japan, 58-79788, Watabe, May 1983.

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