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Frequency domain optical storage presents a method of storing information at densities of 1011–1012 bits/cm2,1 Persistent spectral hole burning PHB) allows binary data to be encoded by the presence or absence of holes burned in inhomogeneously broadened absorption bands at low temperature by exposure to narrowband light from a tunable laser. Typical hole widths are ~100 MHz, while typical line widths are ~200 GHz, making it possible to write >103 holes in a tightly focussed laser spot.
© 1986 Optical Society of America
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