Patent Number: 
Section: claims

1. A device for applying laser radiation (13) to an outside surface of a rotationally symmetrical component (11, 11′, 11″), comprising a plurality of lenses (10), through which the laser radiation (13) passes and which are designed and/or are arranged in such a way that an axis of symmetry (12, 12′, 12″) of the component (11, 11′, 11″) is located at a focal point of each of the lenses (10). 2. The device according to claim 1, wherein the device comprises homogenizers (14, 18, 21), one homogenizer associated with each of the lenses (10), homogenizing the laser radiation (13) before passing through each of the lenses (10). 3. The device according to claim 2, wherein when a number of the lenses (10) is less than eight, the homogenizers (14, 18, 21) are designed such that the laser radiation (13) has a top-hat intensity distribution wherein intensity decreases toward edges according to cos 2 (φ), and wherein, when a number of the lenses (10) is greater than or equal to eight, the homogenizers (14, 18, 21) are designed such that the laser radiation (13) has a linear top-hat intensity distribution. 4. The device according to claim 2, wherein the homogenizers (14,18) comprise at least one lens array (15, 16) or a light guide (19). 5. The device according to claim 4, wherein the homogenizers (14, 18) comprise two lens arrays (15, 16). 6. The device according to claim 2, wherein the homogenizer (21) comprises a waveguide (23) having at least partially cuboidal light-guiding region (26). 7. The device according to claim 6, wherein a first extent (D1) of the light-guiding region (26) that extends between an entrance face and an exit face of the light-guiding region (26) is greater than a second (D2) and/or a third extent (D3) that is perpendicular to the first extent (D1) of the light-guiding region (26). 8. The device according to claim 7, wherein first extent (D1) of the light-guiding region (26) that extends between an entrance face and an exit face of the light-guiding region (26) is greater than a second and/or third extent (D2, D3) that is perpendicular to the first extent (D1) of the light-guiding region (260), by a factor of at least 3. 9. The device according to claim 8, wherein the factor is between at least 7 and at most 100. 10. The device according to claim 2, wherein the device comprises an optical arrangement to expose at least one of the lenses (10) to laser radiation (13). 11. The device according to claim 10, wherein the optical arrangement and/or the homogenizer (14, 18, 21) are designed such that an entrance face of each of the lenses (10) is exposed to a homogeneous spatial distribution or to a homogeneous spatial intensity distribution of the laser radiation (13). 12. The device according to claim 10, wherein the optical arrangement and/or the homogenizer (14, 18, 21) are designed such that an entrance face of each of the lenses (10) is exposed to a homogeneous spatial distribution or to a homogeneous spatial intensity distribution of the laser radiation (13) matching a design of the lens (10). 13. The device according to claim 10, wherein the homogenizers (14, 18, 21) are encompassed by the optical arrangement. 14. The device according to claim 10, wherein the optical arrangement comprises a collimator. 15. The device according to claim 14, wherein the collimator comprises at least one lens for collimation, which is designed and arranged in the device such that the laser radiation is incident on the lenses (10) with no divergence or with the smallest possible divergence, or is at least substantially collimated. 16. The device according to claim 2, wherein the lenses (10) are arranged in the circumferential direction next to one another. 17. The device according to claim 16, wherein the lenses (10) adjoin one another, with respect to the axis of symmetry (12, 12′, 12″) of the component (11, 11′, 11″). 18. The device according to claim 2, wherein at least one of the lenses (10) are arranged so that the direction in which the laser radiation (13) propagates after passing through the at least one of the lenses (10) has with respect to the axis of symmetry (12, 12′, 12″) of the component (11, 11′, 11″) both a radial and an axial component. 19. The device according to claim 2, wherein each of the lenses (10) is arranged lenses (10) has with respect to the axis of symmetry (12, 12′, 12″) of the component (11, 11′, 11″) both a radial and an axial component. 20. The device according to claim 1, wherein each of the lenses (10) has for the laser radiation (13) an enhance face facing away from the component (11, 11′, 11″) and an exit face facing the component (11, 11′, 11″). 21. The device according to claim 1, wherein at least two the lenses (10) have an identical focal length (f). 22. The device according to claim 1, wherein at least one of the lenses (10) are cylindrical lenses having cylinder axes that are parallel to the axis of symmetry (12, 12′, 12″) of the component (11, 11′, 11″). 23. The device according to claim 1, wherein at least one of the lenses (10) have a rotationally-symmetrical curvature. 24. The device according to claim 23, wherein at least one of the lenses (10) have a rotationally-symmetrical curvature. 25. The device according to claim 24, wherein at least one of the lenses (10) are spherical lenses (10). 26. The device according to claim 24, wherein the lenses (10) are spherical lenses (10). 27. The device according to claim 1, wherein each of the lenses (10) has an identical focal length (f). 28. The device according to claim 1, wherein the device comprises an optical arrangement to expose each of the lenses (10) to laser radiation (13). 29. The device according to claim 1, wherein the lenses (10) are cylindrical lenses having cylinder axes that are parallel to the axis of symmetry (12, 12′, 12″) of the component (11, 11′, 11″). 30. The device according to claim 1, wherein each of the lenses (10) has a rotationally-symmetrical curvature. 31. The device according to claim 1, wherein the plural lenses (10) are three or more lenses arranged in a closed geometric configuration with the plural lenses (10) adjoining at corners of the closed geometric configuration with the component (11, 11′, 11″) enclosed by the geometric configuration. 32. The device according to claim 1, wherein none of the laser radiation bypasses the component (11, 11′, 11″). 33. The device according to claim 1, wherein an entire angular space of a circumference of the component (11, 11′, 11″) is illuminated, and wherein a numerical aperture of the plural lenses (10) is determined as follows:NA=sin(α/2)with α=360°/number of lenses.