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1.6 μm emission originated from Pr[sup 3+]: ([sup 3]F[sub 3],[sup 3]F[sub 4])→[sup 3]H[sub 4] transition in Pr[sup 3+]- and Pr[sup 3+]/Er[sup 3+]-doped selenide glasses were investigated under an optical pump of a conventional 1480 nm laser diode. The measured peak wavelength and full width at half maximum of the fluorescent emission were ∼1650 and >100 nm, respectively. A moderate lifetime of the thermally coupled upper manifolds (∼212±5 μs) together with a high stimulated emission cross section of ∼(3±1)x10[sup -20] cm[sup 2] promises to be useful for 1.6 μm band fiber-optic amplifier that can be pumped with an existing high-power laser diode. Codoping of Er[sup 3+] significantly enhanced the emission intensity by way of a nonradiative Er[sup 3+]: [sup 4]I[sub 13/2]→Pr[sup 3+]: ([sup 3]F[sub 3],[sup 3]F[sub 4]) energy transfer. © 2001 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Irradiation of x-rays has induced room-temperature persistent spectral hole burning (PSHB) in Eu[sup 3+]-doped borate glasses melted under an inert atmosphere. Defects were formed by x-ray irradiation and these defects, especially electron trapping centers near rare-earth ions in glasses, were responsible for the PSHB. Electrons were released from these defects upon irradiation of a burning light. Photoreduction of Eu[sup 3+] to Eu[sup 2+] by trapping these electrons resulted in the formation of persistent spectral holes. © 2001 American Institute of Physics. [ABSTRACT FROM AUTHOR]