Optical arrangements for processing a workpiece
First Claim
1. An optical arrangement for processing a workpiece, comprising:
- a fiber laser arrangement configured to emit laser radiation;
a fiber arrangement directly coupled to the fiber laser arrangement and configured to guide the laser radiation from the fiber laser arrangement to the workpiece to be processed, wherein the fiber arrangement comprises a transport fiber having a fiber core and one or more fiber claddings surrounding the fiber core; and
at least one coupling device configured to couple a portion of the laser radiation guided in the fiber arrangement into at least one fiber cladding of the transport fiber,wherein a spectral bandwidth of the coupling device has at least the same magnitude as a spectral bandwidth of the laser radiation emitted by the fiber laser arrangement,wherein the fiber laser arrangement comprises a resonator having an active fiber, and the resonator is formed between a first fiber Bragg grating and a second fiber Bragg grating, and wherein a spectral bandwidth of a reflectivity of the second fiber Bragg grating is smaller than and within a spectral bandwidth of a reflectivity of the first fiber Bragg grating, such that the spectral bandwidth of the laser radiation of the fiber laser arrangement corresponds to the spectral bandwidth of the reflectivity of the second fiber Bragg grating,wherein the fiber laser arrangement is configured to change a beam profile of the laser radiation guided in the direction of the workpiece to be processed by shifting the spectral bandwidth of the laser radiation of the fiber laser arrangement relative to the spectral bandwidth of the coupling device and thereby changing the portion of the laser radiation that is coupled into the at least one fiber cladding of the transport fiber, andwherein the fiber laser arrangement is configured to shift the spectral bandwidth of the laser radiation of the fiber laser arrangement relative to the spectral bandwidth of the coupling device by spectrally shifting the spectral bandwidth of the reflectivity of the second fiber Bragg grating relative to the spectral bandwidth of the reflectivity of the first fiber Bragg grating.
1 Assignment
0 Petitions
Accused Products
Abstract
Optical arrangements for processing a workpiece include a fiber laser arrangement for emitting laser radiation, a fiber arrangement directly coupled to the fiber laser arrangement and configured to guide the laser radiation in a direction to the workpiece to be processed, the fiber arrangement including a transport fiber having a fiber core and at least one fiber cladding surrounding the fiber core, and at least one coupling device for coupling a portion of the laser radiation guided in the fiber arrangement into at least one fiber cladding of the transport fiber. The coupling device has a spectral bandwidth of at least the same magnitude as a spectral bandwidth of the laser radiation. The fiber laser arrangement is configured to change a beam profile of the guided laser radiation to shift the spectral bandwidth of the laser radiation relative to the spectral bandwidth of the coupling device.
16 Citations
18 Claims
-
1. An optical arrangement for processing a workpiece, comprising:
-
a fiber laser arrangement configured to emit laser radiation; a fiber arrangement directly coupled to the fiber laser arrangement and configured to guide the laser radiation from the fiber laser arrangement to the workpiece to be processed, wherein the fiber arrangement comprises a transport fiber having a fiber core and one or more fiber claddings surrounding the fiber core; and at least one coupling device configured to couple a portion of the laser radiation guided in the fiber arrangement into at least one fiber cladding of the transport fiber, wherein a spectral bandwidth of the coupling device has at least the same magnitude as a spectral bandwidth of the laser radiation emitted by the fiber laser arrangement, wherein the fiber laser arrangement comprises a resonator having an active fiber, and the resonator is formed between a first fiber Bragg grating and a second fiber Bragg grating, and wherein a spectral bandwidth of a reflectivity of the second fiber Bragg grating is smaller than and within a spectral bandwidth of a reflectivity of the first fiber Bragg grating, such that the spectral bandwidth of the laser radiation of the fiber laser arrangement corresponds to the spectral bandwidth of the reflectivity of the second fiber Bragg grating, wherein the fiber laser arrangement is configured to change a beam profile of the laser radiation guided in the direction of the workpiece to be processed by shifting the spectral bandwidth of the laser radiation of the fiber laser arrangement relative to the spectral bandwidth of the coupling device and thereby changing the portion of the laser radiation that is coupled into the at least one fiber cladding of the transport fiber, and wherein the fiber laser arrangement is configured to shift the spectral bandwidth of the laser radiation of the fiber laser arrangement relative to the spectral bandwidth of the coupling device by spectrally shifting the spectral bandwidth of the reflectivity of the second fiber Bragg grating relative to the spectral bandwidth of the reflectivity of the first fiber Bragg grating. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A method of processing a workpiece by an optical arrangement, the method comprising:
-
guiding a laser radiation generated from a laser arrangement in a direction to the workpiece to be processed by a fiber arrangement directly coupled to the laser arrangement, wherein the fiber arrangement comprises a transport fiber having a fiber core and one or more fiber claddings surrounding the fiber core; coupling, by at least one coupling device, a portion of the laser radiation guided in the fiber arrangement into at least one fiber cladding of the transport fiber; and changing a beam profile of the laser radiation guided in the direction of the workpiece to be processed by shifting a spectral bandwidth of the laser radiation of the fiber laser arrangement relative to a spectral bandwidth of the coupling device and thereby changing the portion of the laser radiation that is coupled into the at least one fiber cladding of the transport fiber, wherein the spectral bandwidth of the coupling device has at least the same magnitude as the spectral bandwidth of the laser radiation, wherein the laser arrangement comprises a resonator formed between a first fiber Bragg grating and a second fiber Bragg grating, and wherein a spectral bandwidth of a reflectivity of the second fiber Bragg grating is smaller than and within a spectral bandwidth of a reflectivity of the first fiber Bragg grating, such that the spectral bandwidth of the laser radiation of the fiber laser arrangement corresponds to the spectral bandwidth of the reflectivity of the second fiber Bragg grating, and wherein shifting the spectral bandwidth of the laser radiation relative to the spectral bandwidth of the coupling device comprises; spectrally shifting the spectral bandwidth of the reflectivity of the second fiber Bragg grating relative to the spectral bandwidth of the reflectivity of the first fiber Bragg grating. - View Dependent Claims (14, 15, 16, 17, 18)
-
Specification