Precitec Gmbh & Co. Kg

David Blázquez Sánchez

A device for determining a focal position of a laser beam, in particular a processing laser beam in a laser processing head, has an optical decoupling element for decoupling a partial beam from a beam path of the laser beam, a detector for detecting at least one beam parameter of the partial beam, and at least one optical element with an adjustable focal length, which is arranged in a region of the beam path of the partial beam between the optical decoupling element and the detector. Also disclosed is a laser processing head which includes a device of this type, as well as a method for determining a focal position of a laser beam.

Device and method for determining a focal position of laser beam

A device is provided for setting a focus position (z) of a laser beam in a laser machining system. The device comprises a computing unit configured to calculate a time-dependent value zof the focus position (z), wherein the computing unit calculates the time-dependent value zof the focus position (z) based on a first parameter and a second parameter, wherein the first parameter indicates a magnitude A of a laser-power dependent focus shift per power unit and the second parameter indicates a time constant τ of a change in focus position due to a thermal lens by a factor of 1/e, and a control unit configured to use a mechanism for setting the focus position (z) to set the focus position (z) of the laser beam based on the time-dependent value zof the focus position (z).

Device for setting a focus position of a laser beam in a laser machining system, laser machining system comprising the same, and method for setting a focus position of a laser beam in a laser machining system

A device for determining a focus position of a laser beam in a laser machining system has a first optical element which is designed to reflect a portion of the laser beam in order to uncouple a first sub-beam of the laser beam, a second optical element which is designed to reflect another portion of the laser beam in order to uncouple a second sub-beam of the laser beam substantially coaxially to the first sub-beam, a spatially-resolving sensor to which the first sub-beam and the second sub-beam can be directed, and an evaluation unit which is designed to determine a focus position of the laser beam on the basis of the first and second sub-beams hitting the spatially-resolving sensor.

Device for determining a focus position in a laser machining system, laser machining system comprising same, and method for determining a focus position in a laser machining system

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Gaggenau, Germany

David Blázquez Sánchez