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 solar photoelectric module comprises a composite parabolic solar energy concentrator having an aperture angle .alpha. and contrived in the form of a sealed gas-filled bulb. The side walls of the bulb bend on a predetermined radius to a cylindrical part thereof beside a concentrator radiation outlet surface which is coated with an inside reflecting coating. A photoreceiver having a cooling system is arranged inside the cylindrical portion of the bulb with a gap separating it from the walls. The cooling system disposed inside the concentrator bulb comprises a metal heat sink with air cooling ribs. The invention prolongs the service life of the module, improves its dependability and efficiency, and reduces its cost.