Multi-context holographic memory exploiting a wavelength-dependent optimization technique

A wavelength-dependent optimization technique is proposed for two-dimensional (2D) holographic memories to improve the holographic memory recording density. When using holographic memory as electrical memory, a photodiode array is frequently used to convert diffracted light from the holographic memory to electrical signals. However, when using lasers of various wavelengths to read multiple contexts, although the light of each laser has different diffraction limitations, the photodiode array resolution must be designed based on the longest wavelength laser's light diffraction limitation. The proposed technique achieved the best recording density for a 2D holographic memory for lasers of every wavelength by adjusting the recording region size of the holographic memory for each context to satisfy the resolution of the photodiode array.