Abstract
Optimistic estimates put the limits for PSHB storage up to 1012 bits per cm2 (i.e. 104 spectral holes per each diffraction limited surface pixel of the size of λ·λ=10-8 cm2, λ- wavelength) or 1016 bits per cm3 for a volume storage memory (cell size λ·λ·λ=1012 cm3). Energy transfer between impurities destroys the storage. Interaction is absent at low concentrations, however, the latter may result in critical decrease of the number of impurity moleculess available to burn a hole at a fixed wavelength at a fixed spatial spot. If we assume concentration of non-interacting impurities 1018 molecules per cm3, and the storage density of 1012 bits per cm2 or 1016 bits per cm3, there is only 100 molecules on average to store one bit of information. It is a too small amount because of the fluctuations of the number of molecules per cell [1,2] and references therein.
© 1992 Optical Society of America
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