Abstract: A solar concentrator comprises a prism having radiation input, reflection and output faces. Located on the input and/or reflection face(s) is a layer of material with a formed three-dimensional hologram of transmitting type in the case of the input face or of reflecting type in the case of the reflection face. The structure of the hologram permits radiation input to the prism at an angle greater than the critical angle of total internal reflection to be reflected within the prism without being diffracted by the hologram.

Abstract: A method of manufacturing a solar concentrator employing a prism having a radiation input face, a reflection face and at least one radiation output face. The method comprises the steps of providing the prism with its reflection face angularly disposed with respect to the input face. A layer of light-sensitive material is deposited on the input face of the prism. An auxiliary prism and a substance having a refractive index close to that of the light-sensitive material is provided with the substance placed between the light-sensitive material and the auxiliary prism. Next, an interference pattern is recorded in the light-sensitive layer to obtain a three dimensional hologram. This is accomplished by using a reference laser beam and an object laser beam. The reference laser beam is sent to the light-sensitive layer via the auxiliary prism and the substance in the direction of propagation of the incident radiation to be concentrated.

Abstract: A light radiation concentrator comprises a frame and at least two radiation concentrating facets secured therein, the facets being made in the form of holograms. The structure of the diffraction gratings of the holograms is such that the concentrating facets have a common focal spot.A method of making a light radiation concentrator consists in using light-sensitive objects, the number of which is equal to the number of the concentrating facets. The light-sensitive objects are secured in the concentrator frame and an interference pattern produced by a collimated reference radiation beam and an object radiation beam diverging from the focal spot is recorded in a sequence on each of the light-sensitive objects. The recording is effected by causing the collimated reference beam to move in parallel with itself and by directing the object beam from the focal spot to the respective light-sensitive object.

Abstract: A photoelectric solar cell device comprises a dispersing element exposed to the sun's radiation and followed in the optical path by photocells having different spectral sensitivities. Each photocell has its working surface so oriented that the light beam with the wavelength corresponding to the maximum spectral sensitivity of that photocell impinges on its working surface. The dispersing element is a hologram representing light sources with different wavelengths. The photocells are positioned in the image planes of the light sources producing the light beams of the corresponding wavelengths.