Abstract
A multiple-hole structure with a center hole of more than 20% depth was observed in the persistent hole-burning spectroscopy for the 4F 3/2(1)– 4I 9/2 transition of the Nd 3+ doped silicate glass fiber at 1.5 K using a diode laser. The multiple-hole structure was attributed to the hyperfine interaction between the effective electron spin and the nuclear spin of the Nd 3+ ion. The hole grow and decay processes were observed to be logarithmic time-dependent. Finally the demonstration of optical memory was presented.
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