Patent DE-102010012459-A1 (DE)
Title: Device for applying laser radiation to a partially reflective/transparent region of a workpiece disposed in a working area, comprises a laser light source to generate the laser radiation and optical unit for influencing the laser radiation
Inventor: LISSOTSCHENKO VITALIJ DR
IPC: B23K26/06
Filed: 2010-03-24
Abstract: The device for applying laser radiation (1) to a partially reflective or transparent region of a workpiece disposed in a working area (4), comprises a laser light source to generate the laser radiation and optical unit for influencing the laser radiation such that the radiation is transferred into the working area, where the optical unit comprises a mirror (6, 7, 8, 9) that reflects a part of the laser radiation reflected in the working area or a part of the laser radiation passing through the working area such that the part of the laser radiation is partially fed back into the working area. The device for applying laser radiation (1) to a partially reflective or transparent region of a workpiece disposed in a working area (4), comprises a laser light source for generating the laser radiation and optical unit for influencing the laser radiation such that the radiation is transferred into the working area, where the optical unit comprises a mirror (6, 7, 8, 9) that reflects a part of the laser radiation reflected in the working area or a part of the laser radiation passing through the working area such that the part of the laser radiation is partially fed back into the working area. The optical unit comprises a lens with positive refractive force. The lens is arranged between the working area and the mirror. A first mirror is arranged at the side of the working area turned away from the laser light source, and reflects a part of the laser radiation passed through the working area, so that the part of the radiation is partially fed back to the working area. The device comprises a second mirror in addition to the first mirror at the side of the working area turned to the laser light source, where the second mirror reflects a part of the laser radiation from the first mirror and reflects the part of the laser radiation partially passed through the working area, so that the part of the laser radiation is partially fed back to the working area. The mirrors are only arranged at the side of the working area turned towards the laser light source, where the mirrors reflect the part of the laser radiation reflected in the working area, so that the part of the laser radiation is partially fed back to the working area. The optical unit comprises more than one mirror at one or each of the sides of the working area. The mirrors arranged at the same side of the working area are inclined to each other at an angle of 90[deg] . The mirror is curved with a parabolic or an elliptical cross-section. The mirror has an outer and/or inner mirrored surface. The device comprises a polarization-selective beam divider, from which the laser radiation is reflected in the working area, and a polarization rotator, which rotates the polarization direction of the laser radiation at 90[deg] before and/or after the passage through the beam divider. The optical unit comprises a lens array unit, which is arranged in the device so that the part of the laser radiation passing through the working area passes through the lens array unit before feeding back into the working area, where a reduction of the Rayleigh length of the focal area of the part of the laser radiation fed back into the working area is reduced or prevented through the lens array unit. Independent claims are included for: (1) a device for imaging a line-shaped light distribution of a first plane in a second plane; (2) a laser device; and (3) a method for producing a device.