An apparatus for producing a bessel - light beam with at least one electro-optical element

摘要

Disclosed is a device for generating a bessel - light beam with at least one electro-optical element, which, by way of a light energy - and light output surface, which is in each case along a the electro-optical element and the optical axis passing through are located opposite one another in the longitudinal extension of the optical axis, has a the electro-optical element provides for laterally delimiting surface.The present invention is characterized in that plane electrodes arranged in such a way and are arranged along the outer surface that, in the case of application of an electrical voltage to the plane electrodes in the interior of the electro-optical element, an electric field can be generated, whose to the optical axis of radially oriented field-strength profile is linearly proportional to the radial distance from the optical axis changes.