Zweistrahl-Lichtablenker mit gesteuerter Strahlumschaltung

摘要

The invention relates to a light beam deflector consisting of a light source (1), a first polarisation converter (7) and a rotary deflecting unit (4). The deflecting unit (4) has a second polarisation converter (8), a polarizing beam splitter (9), a third polarisation converter (10) and a reflector (11). The polarisation converter (7) changes the polarisation of the light beam (2) into a circular type and converts the circular direction of rotation depending on a control signal. The polarization converter (8) changes the circular polarisation of the light beam (2) depending on the circular direction of rotation into a linear type with two polarisation states. Depending on the polarisation state, the light beam (2) is reflected at the polarizing beam splitter (9) as a first output beam (19) or a second one (20) rotated through 180 DEG . At each revolution of the deflecting unit (4) a working range can be established by the control signal in which only one of the output beams is switched on. The one which is switched on has the full light output of the light beam (2), thus achieving both high optical efficiency and a high yield.