Observation of ⁴F_3/2 to ⁴I_15/2 radiative transition in Nd³⁺ ions in GaLaS glass using frequency-resolved PL spectroscopy

Aoki, Takeshi, Koughia, Kirill, Fujimoto, K., Fujihashi, C., DeCorby, R., Haugen, C., Hewak, D.W., Tonchev, D. and Kasap, Safa (2009) Observation of ⁴F_3/2 to ⁴I_15/2 radiative transition in Nd³⁺ ions in GaLaS glass using frequency-resolved PL spectroscopy. Physica Status Solidi (c), 6 (S1), S54-S58. (doi:10.1002/pssc.200881272).

Abstract

The photoluminescence (PL) emission band corresponding to ⁴F_3/2 to ⁴I_15/2 transition has been revealed using a double lock-in technique and quadrature frequency resolved spectroscopy (QFRS) at room temperature in Nd³⁺ in a GaLaS glass. The band is centred around 1840 nm and has a lifetime ~77µs, which seems to be the same for all four radiative transitions ⁴F_3/2 to ⁴I_J (J = 9/2, 11/2, 13/2 and 15/2). The branching ratios β J of the four above transitions have been estimated from the PL data and agree well with the results of Judd-Ofelt (JO) analysis. In addition to the 1840 nm band, we have observed another PL band appearing around 1580 nm and having a dominant lifetime ~3.8 µs. This band may be identified with the radiative transition from the doublet (⁴F_5/2, ²H_9/2) to the ⁴I_15/2 manifold. The short lifetime ~3.8 µs may be caused by effective multiphonon relaxation from the doublet to the ⁴F_3/2 manifold.

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Contributors

Author: D.W. Hewak

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