Optischer Phasenmodulator

摘要

The aim of the invention is to provide a phase modulator for introducing a topological phase which is configured for producing any given phase shift between zero and 360 DEG . To this end, the inventive phase modulator has (a) means - at least one double refracting electro-optical delay device with a rotatable indicatrix - with which the polarisation of the light is guided on at least one closed path on the Poincaré sphere during the transmission through the modulator, said indicatrix rotating according to the selected phase shift and the amount representing the total rotating surface on the Poincaré sphere being equal to phi .