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公开(公告)号：US20210146478A1
公开(公告)日：2021-05-20
申请号：US17045947
申请日：2019-03-19
Applicant: Rofin-Sinar Laser GmbH
Inventor： Oliver FORSTER , Peter KALLAGE , Jens SCHÜTTLER
Abstract: The invention relates to a method for laser welding workpieces (W), a laser beam (L) directed onto a workpiece surface having such a radiation intensity that the workpiece material of the at least one workpiece (W) to be welded is melted in the region of the laser focus (F), a vapor capillary (D) which is at least partly surrounded by a molten bath (S) forming in the region of the laser focus (F). The laser beam (L) is moved relative to the workpiece surface in a direction of advance (V) in order to produce a weld seam. According to the invention, the molten bath (S) is subjected to mechanical stress by directing a gas stream (G) onto the workpiece surface for the purpose of stabilization during welding. The invention further relates to a device (1) designed for carrying out said method.
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公开(公告)号：US20200067256A1
公开(公告)日：2020-02-27
申请号：US16674544
申请日：2019-11-05
Applicant: Rofin-Sinar Laser GmbH
Inventor： Peter ROSENTHAL , Jens SCHÜTTLER , Florian ENGEL , Gongxue HUA
Abstract: A CO2 laser that generates laser-radiation in just one emission band of a CO2 gas-mixture has resonator mirrors that form an unstable resonator and at least one spectrally-selective element located on the optical axis of the resonator. The spectrally-selective element may be in the form of one or more protruding or recessed surfaces. Spectral-selectivity is enhanced by forming a stable resonator along the optical axis that includes the spectrally-selective element. The CO2 laser is tunable between emission bands by translating the spectrally-selective element along the optical axis.
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公开(公告)号：US20210242656A1
公开(公告)日：2021-08-05
申请号：US16330735
申请日：2017-07-13
Applicant: Rofin Sinar Laser GMBH
Inventor： Jens SCHÜTTLER , Florian ENGEL , Hermann HAGE
Abstract: The invention relates to a resonator mirror (4) for an optical resonator (1) of a laser device (2), especially of a gas laser or a slab waveguide laser, comprising a reflective surface (6) with a structured area (5) which spans across a region of the reflective surface (6) centered about the optical axis (5). According to one variant of the principle underlying the invention, the structured area (5) has at least one reflective surface cross-section (8, 18, 28, 38, 48, 58, 68) which is offset with respect to the reflective surface (6) outside the structured area (5) and parallel to the optical axis (A) by half of a predefined wavelength or by a whole multiple of half the predefined wavelength. According to another variant, the structured area (5) has at least two surface cross-sections (8, 18, 28, 38, 48, 58, 68) which are offset against each other and parallel to the optical axis (A) by half of a predefined wavelength or by a whole multiple of half the predefined wavelength. In addition, the invention relates to a laser device (2) whose optical resonator (1) comprises a resonator mirror (4) designed in such a manner.
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公开(公告)号：US20180069365A1
公开(公告)日：2018-03-08
申请号：US15697343
申请日：2017-09-06
Applicant: Rofin-Sinar Laser GmbH
Inventor： Peter ROSENTHAL , Jens SCHÜTTLER , Florian ENGEL , Gongxue HUA
CPC classification number: H01S3/0315 , H01S3/0606 , H01S3/063 , H01S3/08004 , H01S3/08068 , H01S3/08081 , H01S3/0818 , H01S3/082 , H01S3/1053 , H01S3/2232
Abstract: A CO2 laser that generates laser-radiation in just one emission band of a CO2 gas-mixture has resonator mirrors that form an unstable resonator and at least one spectrally-selective element located on the optical axis of the resonator. The spectrally-selective element may be in the form of one or more protruding or recessed surfaces. Spectral-selectivity is enhanced by forming a stable resonator along the optical axis that includes the spectrally-selective element. The CO2 laser is tunable between emission bands by translating the spectrally-selective element along the optical axis.
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