Abstract: In a holographic screen for laser front projection, of at least one or more laser wavelengths that selectively back-scatter the incident spectrally narrow-band laser radiation in a predetermined solid angle and simultaneously highly absorbs the disturbing spectrally broad-band ambient light, it is proposed that it have at least one holographic volume grating that is optically coupled to a light absorber.

Abstract: The invention concerns a holographic screen for the laser back-projection of at least one or a plurality of laser wavelengths, said holographic screen selectively and diffusely front-scattering the incident narrow-band laser radiation in a predetermined solid angle and simultaneously allowing through the disruptive spectrally broad-band ambient light from the observation area. To that end, the holographic screen comprises at least one holographic transmission grid which is coupled to a light absorber.

Abstract: An optical wide angle sensor head for directionally sensing optical radiation is made of a plurality of individual sensor optical elements. Each sensor optical element is arranged at an input end of its own fiber optical conductor and has its own light entrance, its own field of view and its own individual optical axis. Neighboring fields of view may overlap each other. The fiber optical conductors lead to a transducer for converting the individual light signals into respective electrical signals. The individual sensor optical elements are arranged on a common mounting member in a housing so that the individual optical axes pass through a common intersection in front of said light entrances. The mounting member is a flat plate or a concave plate having a concave curvature facing in the viewing direction, whereby a spherical mounting is avoided.