Device for generating laser radiation having a linear intensity distribution
View Patent ↗The invention relates to a device for generating laser radiation ( 3 ) having a linear intensity distribution ( 11 ), comprising a plurality of laser light sources for generating laser radiation ( 3 ) and optical means for transforming laser radiation ( 3 ) exiting from the laser light sources into laser radiation ( 14 ) that has a linear intensity distribution ( 11 ) in a working plane ( 9 ), wherein the laser light sources are constructed as fundamental mode lasers and the device is designed such that each of the laser beams ( 3 ) exiting from the laser light sources does not overlap with itself.
1. A device for generating laser radiation ( 14 ) having a linear intensity distribution ( 11 ), comprising:
a plurality of laser light sources for generating laser beams ( 3 ), wherein the laser light sources are each formed as fiber lasers, wherein the device comprises ferrules for the ends of the fiber laser or for optical fibers ( 1 ) connected to the fiber lasers, and wherein the ferrules associated with the individual laser light sources are connected with one another in several common holders ( 2 ),
an optical device transferring the laser beams ( 3 ) emerging from the laser light sources and producing a laser radiation ( 14 ) with a linear intensity distribution ( 11 ) in a working plane ( 9 ), wherein the optical device comprises collimating and/or imaging lenses ( 4 , 8 ) and at least one holder ( 5 , 7 ),
wherein the laser light sources are formed as fundamental mode lasers, and the device is designed such that each of the laser beams ( 3 ) emerging from the laser light sources is not overlapped with itself, wherein at least one of the several common holders ( 2 ) for the ferrules and the at least one holder ( 5 , 7 ) of the optical device are connected with each other to form at least one module, and the device comprises a plurality of modules associated with the holders ( 2 , 5 , 7 ) and modularly connectable to each other.
2. The device according to claim 1 , wherein the laser light sources generate laser beams ( 3 ) having a beam quality factor M 2 of less than 2.0.
3. The device according to claim 1 , wherein the device is designed in such a way that the linear intensity distribution ( 11 ) has in the working plane ( 9 ) a ratio of length to width of greater than 10.
4. The device according to claim 1 , wherein only the lateral flanks ( 10 a ) of the intensity distributions ( 10 ) of the individual laser beams ( 3 ) overlap in the longitudinal direction (X) of the line.
5. The device according to claim 1 , wherein the optical device comprises at least one transformation component ( 6 ) transforming a Gaussian distribution into a top-hat distribution.
6. The device according to claim 1 , wherein the device comprises a plurality of transformation components ( 6 ), with each one of the transformation components ( 6 ) being assigned to a respective one of the laser light sources in such a way that the laser beams ( 3 ) exiting from a first laser light source pass through a first transformation component ( 6 ) and the laser beams ( 3 ) exiting from a second laser light source pass through a second transformation component ( 6 ).
7. The device according to claim 1 , wherein the several common holders ( 2 ) are connected with one another in a heat-dissipating fashion.
8. The device according to claim 6 , wherein the optical device comprises at least one holder ( 5 , 7 ) which is designed to be heat-dissipating.
9. The device according to claim 2 , wherein the beam quality factor M 2 of the laser beams ( 3 ) generated by the laser light sources is less than 1.5.
10. The device according to claim 9 , wherein the beam quality factor M 2 of the laser beams ( 3 ) generated by the laser light sources is less than 1.3.
11. The device according to claim 10 , wherein the beam quality factor M 2 of the laser beams ( 3 ) generated by the laser light sources is 1.05.
12. The device according to claim 3 , wherein the device is designed in such a way that the linear intensity distribution ( 11 ) has in the working plane ( 9 ) the ratio of length to width of greater than 20.
13. The device according to claim 11 , wherein the device is designed in such a way that the linear intensity distribution ( 11 ) has in the working plane ( 9 ) the ratio of length to width of greater than 30.
14. The device according to claim 5 , wherein the transformation component ( 6 ) comprises a Powell lens.
15. The device according to claim 1 , wherein the plurality of the modules comprising the holders ( 2 , 5 , 7 ) are interconnectable in a modular fashion in the longitudinal direction (X) of the intensity distribution ( 11 ) to be generated.
16. The device according to claim 1 , wherein the device is designed such that each of the laser beams ( 3 ) emerging from the laser light sources is not overlapped with itself in a region from where each of the laser beams ( 3 ) emerges from the laser light sources and extending to the working plane ( 9 ).