Ushio Denki

Kyoichi Deki

The present invention is for a pulsed laser system in which the total irradiation energy of the laser is controlled by the number of the laser pulses. The invention includes a device for controlling the output of the laser so that the laser oscillation is stopped when the sum of the laser outputs, in response to each pulses, has reached a predetermined level. This device comprises a laser oscillator for outputting a laser beam in response to a repetitive pulse discharge, a photoelectric conversion element, a sample hold circuit and an integrator for sampling and integrating the outputs from the photoelectric conversion elements, and a comparator for comparing the output of the integrator and the output from a reference voltage generator.

System for controlling output of pulsed laser

An apparatus for preventing an optical element of a gas laser from being contaminated by vapor. This apparatus comprises pairs of magnets which apply magnetic fields to charged particles moving in the direction of the optical axis of the gas laser so as to deflect them transversely to the optical axis, and a screen for intercepting charged particles moving transversely to the optical axis of the gas laser.

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Himeji, Japan

Kyoichi Deki