The present invention provides a jitter stable electro-optical modulator for modulating a high power, repetitively pulsed laser having an optical risetime (10% to 90%) of the order of nanoseconds. The electro-optical modulator includes a birefringent electro-optical device; a hydrogen thyratron operated at a preselected high pressure and having an 'ON' and an 'OFF' state; first means responsive to the 'ON' state of the thyratron for impressing a first preselected voltage ...
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