Holographic Concentrator Wedge Substrate Alignment

The patent replaces mechanical alignment and tracking systems with a holographic optical element that inherently directs light to the photovoltaic material. The HOE uses diffraction patterns recorded during fabrication to automatically steer light, eliminating the need for mechanical adjustment mechanisms and reducing system complexity while maintaining high concentration ratios.

The patent changes the optical parameters by using volume holograms with specific refractive index modulations and thicknesses to achieve wavelength-selective diffraction. By recording multiple holograms with different parameters in the same HOE, the system achieves high concentration ratios without requiring mechanical tracking, as the optical parameters themselves perform the light steering function.

The holographic optical element replaces mechanical alignment systems with an optically encoded alignment mechanism. The diffraction patterns are permanently recorded in the HOE during fabrication, providing inherent alignment that is insensitive to mechanical shifts or environmental changes, thus maintaining reliable output power even when mechanical positioning varies.

The patent compensates for potential misalignment issues beforehand by recording multiple wavelength-specific holograms in the same HOE. This creates a robust system where different wavelength ranges are independently directed to the photovoltaic material, providing a cushion against performance degradation from misalignment or non-direct sunlight conditions.

The patent uses thin-film holographic optical elements instead of thick substrates. The volume holograms are recorded in thin layers of photoresist or other suitable materials deposited on transparent substrates. This thin-film approach provides sufficient structural support while dramatically reducing material costs and simplifying manufacturing processes compared to thick substrate conventional approaches.

The patent employs composite structures combining thin transparent substrate materials with holographic photoresist layers. This composite approach provides the necessary mechanical support from the substrate while the thin holographic layer adds the optical functionality at minimal cost and thickness, avoiding the need for expensive thick substrates.