BEAM SPLITTING DEVICE, OPHTHALMOLOGICAL LASER THERAPY SYSTEM, METHOD FOR SCANNING A PATIENT'S EYE, AND METHOD FOR SPLITTING

The invention relates to a beam splitting device (10) for generating a plurality of laser output beams (90-93) from one laser input beam (60), wherein: the beam splitting device (10) has a first beam multiplier element (20) for generating two intermediate beams (75, 76) from the laser input beam (60); the first beam multiplier element (20) has a first polarising beam splitter (22, 42), a second polarising beam splitter (24, 44) and at least one first deflection element (26, 46) for deflecting an intermediate beam (76) by a specified angle: the beam splitting device (10) is designed in such a way that, when the laser input beam (60) is irradiated onto the first polarising beam splitter (22, 42) of the first beam multiplier element (20), the laser input beam (60) is split into the first intermediate beam (75) and the second intermediate beam (76) by means of the first polarising beam splitter (22, 42) of the first beam multiplier element (20); the two intermediate beams (75, 76) span the x-y plane, the second intermediate beam (76) is deflected by the first deflection element (26) by a specified angle, in particular approximately 90° or approximately 180°, the first intermediate beam (75) and the second intermediate beam (76) are irradiated onto the second polarising beam splitter (24) of the first beam multiplier element (20) in such a way that the first intermediate beam (75) and the second intermediate beam (76) radiate away from the second polarising beam splitter (24) of the first beam multiplier element (20) at a substantially parallel mutual offset or with a specified angular difference, in particular of less than 3 mrad, preferably less than 1.4 mrad, particularly preferably less than 0.6 mrad.