Abstract: A method for ascertaining a diffraction characteristic of a hologram element for smart glasses. The method includes a step of outputting a light beam to an observation position on the hologram element by means of a light source, the light beam having at least one predefined wavelength and at least one sending parameter associated with the wavelength. The method also comprises a step of acquiring at least one reflection beam reflected at the observation position and/or transmission beam of the light beam having the predefined wavelength and transmitted through the hologram element at the observation position using at least one detector, wherein a detection parameter of the reflection beam and/or of the transmission beam is acquired at the predefined wavelength, and a step of comparing the sending parameter with the detection parameter in order to ascertain the diffraction characteristic of the hologram element at the observation position.

Abstract: An apparatus and method for recording a holographic optical element. The apparatus includes a first recording unit configured to provide a first wave front for recording the holographic optical element, a second recording unit configured to provide a second wave front for recording the holographic optical element, and (i) a deformable phase plate configured to perform wave front modulation of the first wave front when the holographic optical element is recorded, or (ii) a plurality of deformable phase plates, at least one deformable phase plate (of the plurality of deformable phase plates can be configured to perform wave front modulation of the first wave front when the holographic optical element is recorded.

Abstract: A filter device for an optical sensor, including a hologram having a defined number of holographic functions, which are developed in such a way that the filter device blocks optical radiation that impinges upon the filter device from a defined first solid angle and optical radiation that impinges upon the filter device from a defined second solid angle is able to pass through the filter device.

Abstract: A filter device for an optical sensor, including a hologram having a defined number of holographic functions, which are developed in such a way that the filter device blocks optical radiation that impinges upon the filter device from a defined first solid angle and optical radiation that impinges upon the filter device from a defined second solid angle is able to pass through the filter device.