Accession Number : ADD013488
Title : Electro-Optical Modulator for an Electro-Optically Modulated Laser.
Descriptive Note : Patent, Filed 6 Mar 81, patented 26 May 87,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC
Personal Author(s) : Plourde, Bertrand E ; Mack, Michael E
Report Date : 26 May 1987
Pagination or Media Count : 6
Abstract : The present invention provides a jitter stable eletro-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 across the birefringent electro-optical device; second means responsive to the OFF state of the hydrogen thyratron for impressing a second preselected voltage across the electro-optical modulator at a time coincident with the laser buildup interval; and means for repetitively driving the hydrogen thyratron into the ON and the OFF states repetitively at a preselected repetition rate. The selectively pressurized hydrogen thyratron is placed within a close fitting vented copper housing and is electrically connected across the electrodes of the birefringent device by an impedance matching network and a coaxial cable.
Descriptors : *ELECTROOPTICS, *LIGHT MODULATORS, *PATENTS, *LASER MODULATORS, BIREFRINGENCE, COAXIAL CABLES, ELECTRODES, HIGH POWER, HIGH PRESSURE, HYDROGEN, IMPEDANCE MATCHING, LASERS, MODULATION, MODULATORS, NETWORKS, OPTICAL PROPERTIES, PRESSURIZATION, PULSED LASERS, REPETITION RATE, THYRATRONS, TIME
Subject Categories : Electrooptical and Optoelectronic Devices
Lasers and Masers
Distribution Statement : APPROVED FOR PUBLIC RELEASE