Optical spectroscopy of Pr³⁺in M⁺Bi(XO₄)₂, M⁺= Li or Na and X = W or Mo, locally disordered single crystals

Abstract

NaBi(WO 4 ) 2 (NBW), NaBi(MoO 4 ) 2 (NBMo) and LiBi(MoO 4 ) 2 (LBMo) single crystals grown by the Czochralski technique have been doped up to a praseodymium concentration of [Pr] ≈ 1 × 10 20 cm −3 in the crystal. 10 K polarized optical absorption and photoluminescence measurements have been used to determine the energy position of 32, 39 and 36 Pr 3+ Stark levels in NBW, NBMo and LBMo crystals, respectively. These energy levels were labelled with the appropriate irreducible representations corresponding to a C 2 local symmetry of an average optical centre. Single-electron Hamiltonians including free-ion and crystal field interactions have been used in the fitting of experimental energy levels and in the simulation of the full sequence of the 4f 2 Pr 3+ configuration. 300 K absorption spectra of different 2S+1 L J Pr 3+ multiplets were determined and used in the context of the Judd-Ofelt theory and for the calculation of the 1 D 2 -related emission cross sections of this average Pr 3+ centre. Non-radiative electron relaxation from the 3 P 0 level feeds the 1 D 2 multiplet. This latter level efficiently decays radiatively to the ground 3 H 4 multiplet but still there is a significant rate of radiative decay to the 1 D 2 → 3 F 3 praseodymium laser channel. For [Pr] 2 × 10 19 cm −3 , non-radiative electric dipole-dipole Pr pair energy transfer limits the radiative yield.

Raman Scattering and Nd$^{3+}$ Laser Operation in NaLa(WO$_{4}$)$_{2}$

“…The presently calculated neodymium density in NaLaW has less uncertainty due to its high concentration with regards to previous studies with lower concentrated [42]. Details on the application of this theory to the anisotropic DT and DM have been given in previous works [13], [43]. It should be mentioned here that the anisotropic optical absorption spectra have been averaged weighting by two the contribution.…”

Structural, spectroscopic, and tunable laser properties ofYb3+-dopedNaGd(WCascales1, Serrano2, Esteban‐Betegón3 et al. 2006Phys. Rev. B1424810View full textAdd to dashboardCite

“…35 The simulation was performed using a previously developed code. 36 The used FI parameters, the derived SOM CFPs, and the corresponding energy level schemes obtained for Yb 3+ in each of the two sites are summarized in Table III. The comparison of these calculated levels with the energies corresponding to the experimental OA bands permits to identify the individual contribution of the 2b and 2d sites to the 2 F 7/2 ͑0͒ → 2 F 5/2 ͑0Ј ,1Ј͒ transitions of the Yb 3+ ion.…”

Tunable continuous wave and femtosecond mode-locked Yb3+ laser operation in NaLu(WO4)2

“…The simulation was performed using a previously developed code. 12 The used free ion ͑FI͒ parameters, the derived SOM CFPs, and the corresponding energy level schemes obtained for Yb 3+ in each of the two sites are also included in Table II. The comparison in Table II allows to assign the individual contributions of the 2b and 2d Yb 3+ sites in the 5 K spectra shown in Fig. 4.…”