Spectroscopic and laser properties of Nd 3+ embedded in a 2-hydroxyethyl methacrylate (HEMA) solid plastic host are characterized. The Judd-Ofelt model has been applied to the room temperature absorption intensities of Nd 3+ (4f 3 ) transitions in HEMA to determine the three phenomenological intensity parameters: 2 , 4 and 6 . The intensity parameters are then utilized to determine the radiative decay rates (emission probabilities of transitions) and branching ratios of the Nd 3+ (4f 3 ) transitions from the upper manifold state 4 F 3/2 to the lower-lying multiplet manifolds 4 I J . The predicted decay rates and branching ratios of the Nd 3+ (4f 3 ) inter-manifold transitions in HEMA are compared with those in other laser host media. From the radiative decay rates, the radiative lifetime of the Nd 3+4 F 3/2 excited state is determined.
The inter-Stark energy levels due to crystal-field splittings within the 1 D 2 ! 3 H 4 intermanifold transition of Pr 3þ in calcium fluorapatite, Ca 5 (PO 4 ) 3 F, have been characterized using the fluorescence spectrum at 10 K. The temperature effects of the spectral width and position of the 623.1 (R 2 ! X 4 ) nm line within the 1 D 2 ! 3 H 4 intermanifold of Pr 3þ in this host have also been investigated. The linewidth of this transition was found to increase with increasing temperature. The emission line shifted toward the shorter wavelength (blue shift). The experimental result of the temperature-dependent widths of this emission line is explained using the phonon-ion interaction theory based on the Debye model for phonons in crystalline solids.
A detailed investigation of the temperature effect on widths and shifts of the spectral lines of Nd3+ in LaSc3(BO3)4 has been performed. The spectral lines investigated correspond to the inter-Stark transitions R1→Y3 (1062 nm) and R1→Z4 (1344 nm) within the F3/24→4I11/2 and F3/24→4I13/2 intermanifold transitions, respectively. The widths of these lines and their shifts have been measured as a function of temperature. The linewidths are found to increase with increasing temperature for both transitions; the 1062 nm line shifts to the longer wavelengths, whereas the 1344 nm line shifts to the shorter wavelengths. The theory of phonon-ion interactions has been employed to explain the temperature dependencies of widths and shifts. These interactions give rise to the phonon relaxation processes that are responsible for both the broadening and shifts of the spectral lines.
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