Beam forming device for laser diode arrays
View Patent ↗A device forms laser radiation which has partial beams interspaced in a first direction that is perpendicular to the direction of propagation of the laser radiation, especially for forming laser radiation which is emitted by a laser diode bar. The device contains a plurality of reflective surfaces on which at least one of the interspaced partial beams can be reflected in such a manner that the distances of the partial beams are smaller relative to each other after reflection than before reflection.
1. A device for shaping laser radiation formed from partial beams spaced apart from one another in a first direction, being perpendicular to a propagation direction of the laser radiation, including for shaping the laser radiation that emerges from a laser diode bar, the device comprising:
a substrate having a first refractive interface serving as an entrance surface, and a second refractive interface serving as an exit surface, at least one of said first or second interfaces is configured such that distances between the partial beams are smaller after passage through said substrate than before the passage through said substrate, said substrate rotating the partial beams, each of said first and second interfaces having a plurality of cylindrical lenses, spaced apart from one another with respect to the first direction and having cylindrical axes being inclined with respect to the first direction, said cylindrical lenses are configured such that the partial beams impinge centrally on at least one first of said cylindrical lenses disposed in a center of said first and second interfaces, whereas the partial beams impinge eccentrically on at least one second said cylindrical lenses disposed outside said center of said first and second interfaces, said first and second cylindrical lenses being different from one another.
2. The device according to claim 1 , wherein only one of said first and second interfaces is a structured interface, and the other of said first and second interfaces is a plane interface.
3. The device according to claim 2 , wherein said structured interface has a plurality of prism sections.
4. The device according to claim 3 , wherein said prism sections correspond to one another and are oriented parallel to one another.
5. The device according to claim 3 , wherein said prism sections are embodied differently than one another.
6. The device according to claim 3 , wherein said prism sections have base surfaces and individual ones of the partial beams run one of parallel or in an inclined fashion with respect to said base surfaces.
7. The device according to claim 1 , further comprising a slow-axis collimation device disposed downstream of said substrate in the propagation direction of the laser radiation, said slow-axis collimation device being inclined with respect to the propagation direction.
8. The device according to claim 1 , wherein said cylindrical lenses are configured such that the distances between the partial beams are smaller after passage through said substrate than before the passage through said substrate.
9. The device according to claim 1 , wherein said substrate can rotate the partial beams by 90° about the propagation direction.
10. The device according to claim 1 , wherein said cylindrical lenses are inclined by 45°.