NOVELTY - The apparatus has a reflector that is provided with an aperture (20). A holographic lens (12) diffracts and focuses a radiation (18a) within a primary wavelength band from an energy source e.g. a sun (18) through aperture towards a primary energy receiver (24). The holographic lens transmits the radiation within a secondary wavelength band from the energy source to the reflector. The reflector reflects radiation transmitted by holographic lens towards a secondary energy receiver (22). The reflector has a mirror (14) that focuses radiation transmitted towards secondary energy receiver.    USE - Apparatus for obtaining energy from polychromatic energy source used as energy receivers such as solar photovoltaic cells, thermal receivers, algae, corn, or any other type of photosensitive plants, emitting radiation in different wavelength bands.    ADVANTAGE - Since the light that is beyond the secondary energy receiver's range of spectral sensitivity is now directed towards the photovoltaic panel instead of the secondary energy receiver, and is not wasted, the efficiency of converting solar energy can be increased. The apparatus can maximize the solar-to-electric power conversion by using a thermal mirror array with a photovoltaic cell as the secondary energy receiver. The apparatus can create a specific ratio of photovoltaic (PV) and thermal energy production to provide stability in an intermittent climate. The apparatus can produce a specific minimum biofuel yield, while devoting remaining solar energy to electricity generation in photovoltaic panels. The appropriate holographic lens design modifications are chosen and the system parameters are varied, so that the spectral optical efficiency curves can be modified to achieve the design goal. Since the splitting of the solar spectrum can allow the solar energy not otherwise used for PV and thermal energy production to be used productively by directing it to photosensitive plants such as algae and corn. The design parameters can be controlled to achieve a ratio between biofuel production on one hand and PV and thermal energy production on the other. Since the diffraction efficiency of the holographic lens can always be reduced, and since the aperture size can be made very small, the lower end of the energy distribution range can be formed with preset value. The provided apparatus and techniques can enable the optimization of the energy derived from sunlight to power both photovoltaic cells and allow algae or corn to flourish.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for obtaining energy from polychromatic energy source that emits radiation in primary and secondary wavelength band.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic diagram of a holographic diffraction-through-aperture spectrum splitting system.    Holographic lens (12)    Mirror (14)    Sun (18)    Incident radiation (18a)    Aperture (20)    Secondary energy receiver (22)    Primary energy receiver (24)