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Persistent spectral hole-burning spectroscopy has been carried out for the 3H4→1D2 transition of Pr 3+ in (100−x)SiO 2 ·xNa 2 O glasses with x=10, 20, 33.3 and 45 in order to examine the effect of Na 2 O content on the homogeneous width and hole-burning efficiency. The homogeneous width shows a nearly T-linear dependence below about 10K irrespective of glass composition,...
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