Accession Number : ADD008898

Title :   An Improved Electro-Optical Modulator for an Electro-Optically Modulated Laser.

Descriptive Note : Patent Application,


Personal Author(s) : Plourde,Bertrand E ; Mack,Michael E

Report Date : 06 Mar 1981

Pagination or Media Count : 18

Abstract : 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 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. (Author)

Descriptors :   *Patent applications, *Laser modulators, *Electrooptics, Pulsed lasers, Short pulses, Q switching, Birefringence, Thyratrons, Impedance matching, Coaxial cables, Pulse rate, Stability, High power

Subject Categories : Lasers and Masers
      Electrooptical and Optoelectronic Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE