Device and method for determining a focal position of laser beam
AssigneePrecitec GmbH & Co. KG
InventorDavid Blázquez Sánchez
Life of this patent
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Abstract
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.
Claims15
A device for determining a focal position of a machining laser beam of a laser machining head, said device comprising:
- an optical decoupling element for decoupling a partial beam from a beam path of said machining laser beam before said machining laser beam is incident on a workpiece to be machined, the decoupling element being inclined with respect to the beam path of said machining laser beam;
- a detector for detecting at least one beam parameter of the partial beam;
- at least one optical element which has adjustable focal length and is arranged in a beam path of the decoupled partial beam between said optical decoupling element and said detector;
- and
- a control unit configured to set different focal lengths of said optical element,
- wherein said at least one optical element having adjustable focal length comprises a first optical element having adjustable focal length and a second optical element having adjustable focal length;
- and
- wherein said control unit is configured to set the focal length of the first optical element independently of the focal length of the second optical element.
A method for determining a focal position of a machining laser beam of a laser machining head, said method comprising the steps of:
- decoupling a partial beam from said machining laser beam before said machining laser beam is incident on a workpiece to be machined;
- setting a focal length of at least one optical element which has adjustable focal length and is arranged in a beam path of the decoupled partial beam;
- detecting at least one beam parameter of the partial beam corresponding to the set focal length after passing through said at least one optical element having adjustable focal length;
- and
- determining the focal position of said machining laser beam based on the detected beam parameters and the set focal length,
- wherein said at least one optical element having adjustable focal length comprises a first optical element having adjustable focal length and a second optical element having adjustable focal length;
- and
- wherein the focal length of the first optical element is set independently of the focal length of the second optical element.
Dependencies are inferred from the claim text.