Method and apparatus for machining material with a liquid-guided laser beam
First Claim
1. Method for processing material using a laser that emits a laser beam guided by a liquid jet comprised of liquid with a predetermined radiation absorption coefficient, with radiation from the laser beam being focussed in a focusing cone point range, the laser beam being directed at a nozzle having a nozzle duct provided with a nozzle intake opening disposed in a plane, the method comprising locating a radiation focusing point for coupling the laser beam into the liquid jet at the plane of the intake opening of the nozzle duct;
- conducting the liquid jet in an area surrounding the nozzle intake opening in the absence of a retaining chamber such that a flow speed for said liquid with said predetermined radiation absorption coefficient in the focusing cone point range of the radiation is sufficiently high that a formation of a thermal lens in the focusing point range is suppressed.
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Accused Products
Abstract
An arrangement for processing material with a liquid jet comprising a laser for emitting a laser beam. The arrangement includes a processing module having a nozzle duct connected to a liquid supply line for forming a liquid jet. The nozzle duct has an intake opening lying in an intake opening plane. An optical element couples the laser beam into the liquid jet, and the optical element of the laser beam is focused in a focusing point range and into the intake opening plane of the nozzle duct. The liquid supply line for the nozzle duct defines an area formed above the nozzle intake opening having a height dimensioned relative to the cross-sectional area of the intake opening such that the area above the nozzle intake opening does not include a liquid retaining chamber. The absence of the liquid retaining chamber producing a flow speed for the liquid in a focusing cone point range sufficiently high that, for a predetermined low radiation absorption coefficient for the liquid, the formation of a thermal lens in the liquid in the focusing cone point range is suppressed enough so that no portion of the radiation damages walls of the nozzle duct.
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Citations
17 Claims
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1. Method for processing material using a laser that emits a laser beam guided by a liquid jet comprised of liquid with a predetermined radiation absorption coefficient, with radiation from the laser beam being focussed in a focusing cone point range, the laser beam being directed at a nozzle having a nozzle duct provided with a nozzle intake opening disposed in a plane, the method comprising locating a radiation focusing point for coupling the laser beam into the liquid jet at the plane of the intake opening of the nozzle duct;
- conducting the liquid jet in an area surrounding the nozzle intake opening in the absence of a retaining chamber such that a flow speed for said liquid with said predetermined radiation absorption coefficient in the focusing cone point range of the radiation is sufficiently high that a formation of a thermal lens in the focusing point range is suppressed.
- View Dependent Claims (2, 3, 4, 5)
- 6. Arrangement for processing material with a liquid jet comprising a laser for emitting a laser beam, and a processing module that includes a nozzle having a nozzle duct connected to a liquid supply line for forming a liquid jet comprised of liquid with a predetermined radiation absorption coefficient, the nozzle duct having an intake opening possessing a cross-sectional area and lying in an intake opening plane, an optical element for coupling the laser beam into the liquid jet, the optical element of the laser beam being focused in a focusing point range and into the intake opening plane of the nozzle duct, and the liquid supply line for the nozzle duct defining an area formed above the nozzle intake opening, the area above the nozzle intake opening having a height dimensioned relative to the cross-sectional area of the nozzle intake opening such that the area above the nozzle intake opening is absent a liquid retaining chamber, and a flow speed for said liquid with said predetermined radiation absorption coefficient in a focusing cone point range is sufficiently high that a formation of a thermal lens in the liquid in the focusing cone point range is suppressed.
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16. An arrangement for processing material with a liquid jet, comprising:
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a laser for emitting a laser beam; a processing module that includes a nozzle having a nozzle duct connected to a liquid supply line for forming a liquid jet of a liquid, the nozzle duct having an intake opening lying in an intake opening plane; an optical element for coupling the laser beam into the liquid jet, the optical element being focused into the intake opening plane of the nozzle duct; and means for sufficiently suppressing the formation of a thermal lens in the liquid such that no portion of radiation of the laser damages walls of the nozzle duct. - View Dependent Claims (17)
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Specification