Ushio Denki Kabushiki Kaisha

Kyoichi Deki

Hiroshige Hata

Shinji Sugioka

Masaki Yoshioka

A method for automatically adjusting an optical axis of a laser resonator. Specifically, the angle of a mirror in a laser resonator is changed in a very small stepwise increments, and the laser output before the very little change is compared to the laser output after the incremental change. If the laser output after the very small incremental change is larger than the laser output before the very small incremental change, the angle is automatically changed by a very small amount in the same direction as the previous increment. If the laser output after the very small incremental change is smaller than the previous laser output measurement, the angle is automatically changed by a very small amount in the opposite direction. Thus the optical axis of the laser resonator is adjusted automatically.

Method for automatically adjusting the optical axis of a laser resonator

A method for the frequency stabilization of a laser oscillated from an internal mirror type helium-neon laser device and having an oscillation wavelength of 543 nm is disclosed, wherein a static magnetic field satisfying the following conditions (1)-(3):

Method for the frequency stabilization of internal mirror type

A metal vapor laser device wherein the pressure of carrier gas within a metal vapor laser tube can be normally maintained constant and a stabilized laser beam can be generated. The metal vapor laser device comprises a metal vapor laser tube, and a carrier gas supplier for supplementing carrier gas into the metal vapor laser tube. The carrier gas supplier includes an outer tube substantially impermeable to the carrier gas, and an inner tube having a permeability to the carrier gas which varies according to temperature and partitioning the inside of the outer tube into a reservoir section and a tank section. The inner tube is disposed in the tank section of the outer tube in such a manner as to form a duplex tube. The carrier gas supplier further includes a heater provided on outer peripheries of regions of the outer tube including the reservoir section and the tank section.

Metal vapor laser device

A metal vapor laser device which prevents a possible discharge between an electrode and a pressure detector thereof and can generate a laser beam in a stabilized condition. The metal vapor laser device comprises a metal vapor laser tube, a carrier gas supplier, and a pressure detector. The carrier gas supplier communicates with a discharge spacing within the laser tube by way of a communicating hole formed at an end portion thereof. The pressure detector includes a tube defining a pressure detecting chamber therein and communicating with the inside of the carrier gas supplier, and an energizable detecting element provided in the inside of the pressure detecting chamber. A discharge preventing thin tube is provided in the inside of the carrier gas supplier and has an end connected to the end portion of the carrier gas supplier in such a manner as to surround the communicating hole of the carrier gas supplier. The discharge preventing thin tube extends toward the other end portion of the carrier gas supplier farther than a connecting portion of the carrier gas supplier to the pressure detector, and the other end thereof is opened within the carrier gas supplier.

A metal vapor laser device which can generate laser oscillations stably even if the atmospheric temperature of a metal vapor laser tube thereof varies suddenly. The metal vapor laser device comprises a metal vapor laser tube having a metal tank in which a working metal is contained, a heater for heating the metal in the metal tank, a power source circuit for the heater, a voltage detector for detecting an inter-electrode voltage of the laser tube, and a temperature detector for detecting an atmospheric temperature of the laser tube. The power source circuit includes a controlling circuit for controlling a power supply to the heater in response to detection signals from the voltage detector and the temperature detector to maintain the pressure of the metal vapor within the laser tube constant. When the atmospheric temperature of the laser tube varies suddenly, the operation of the heater is thus feed-forward controlled in response to the detection signal from the temperature detector.

Metal vapor laser device stabilizing system

A metal vapor laser tube of the hollow-cathode type which is simplified in construction and can be assembled by a simple work without much skill and wherein a negative glow portion can be produced stably and an essential function is attained satisfactorily. The metal vapor laser tube comprises a central metal tube member serving as a cathode, and a pair of hard glass end tube members, metal cap members and holding tube members connected in this order in an air-tight relationship to the opposite ends of the central tube member. A Brewster window or a mirror is provided on each of the cap members. An anode member is securely inserted in each of a lot of through-holes formed in the central tube member by way of an insulating member such that an end thereof may be positioned in a discharge opening of the through-hole. A container for containing a working metal therein is securely inserted in each of a lot of different through-holes formed in the central tube member such that the inside thereof may communicate with a fine axial hole of the central tube member. The central tube member constitutes an enclosure for vapor of the working metal.

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Kakogawa, Japan

Kyoichi Deki