Commissariat a L'energie Atomique

Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Commissarait a L'energie Atomique

Jean-Pascal Alfille

Patrick Meyrueis

Patrice Twardowski

Jean-Paul Grandjean

Bernard Stockmann

Jean-Marc Dufaud

Jean Raoux

Jacques Schildknecht

The head () of the cutting apparatus () of the laser comprises a gas supply through a device such as a barrel dispenser which chops the blowing flow rate, which produces a better discharge of the liquid slag melt by the laser beam () out of the plate () to be cut. A measurement () of backscattered light is made in order to check the good quality of cutting, the amount measured being smaller if the cutting actually passes through the plate (), and the frequency or the pressure of the blowing pulses is adjusted by a controlling device () to keep the measure to a minimum by optimizing the slag discharge conditions.

Apparatus and method for laser cutting with a laser implementing gas pulses, the frequency or pressure of which is controlled

A laser cutting device and method using a laser beam passing through an optical device producing a focal spot with a diameter between about 1.5 and 3 mm, and using a working gas flow. According to the device and method, the working gas flow is ejected from a nozzle at a pressure of between about 1 and 3 bars.

Laser cutting method

Device and method for extended distance cutting by laser, in pulse mode

A connection device for injecting a laser beam into an optical fiber is provided. The device includes two half grips for receiving one end of the optical fiber in a gripped position, a connector body for receiving the grips and for holding them in an optical fiber gripped position, and a conduction cooling mechanism for cooling the two half grips.

Device for injecting high energy laser beam into optical fiber

A device for sampling a section of a laser beam using an elongated reflective element that is moved in a main direction that corresponds to the direction of elongation of the element and in a direction perpendicular to the main direction. This sampling device forms a part of a laser beam analyzer and provides a small reflected beam segment to the analyzer that corresponding to the part of the laser beam that impinges upon the moving elongated reflecting element.

Laser beam analyzer

A device for aligning a light beam with an optical fiber in order to introduce the beam into the fiber. The device includes a sample-taking device to sample part of the light beam which falls along the periphery of a circle which has a center on the axis of the fiber. The sampled light is then detected in order to analyze the angular distribution of the corresponding light intensity. The angular distribution becomes uniform when the axis of the light beam coincides with the axis of the optical fiber.

Growing community of inventors

Clamart, France

Jean-Pascal Alfille