Spectroscopic characterization of a Tm3+:SrGdGa3O7 crystal

Dispersible Tm3+‐Doped Nanoparticles that Exhibit Strong 1.47 μm Photoluminescence

“…Shown in Figure 7a are the overlaid emission spectra of the 3 H 4 -3 F 4 transition at a) 294 K and b) 77 K. The reduction in the width of the emission band at high energies indicates that the 3 H 4 levels are thermally populated at room temperature. An estimation of the nine crystalfield levels by Gaussian deconvolution of the overlapped peaks of the 77 K emission was obtained, which was similar to studies done by Ryba-Romanowski et al [34] on Tm 3+ -doped SrGdGa 3 O 7 single crystals grown by the Czochralski method, [35] who only observed six of the nine theoretical crystalfield levels for the 3 F 4 level. The nine crystal-field levels of the 3 F 4 level are derived from the formula 2J+1, which is based on the Russell-Saunders assignment of 2S+1 L J , where J is the total angular momentum and is the sum of the spin (S) and orbital (L) angular momenta.…”

Thulium doped monoclinic KLu(WO4)2 single crystals: growth and spectroscopy

“…It is clear that the average Tm-Tm distance in the lowest doped samples is too large in comparison to the critical distance where the cross relaxation phenomena take place, namely ≈ 1.3 nm, therefore energy transfer does not occur and the decays can be expected to be a single exponential as it is indeed found. The average Tm-Tm distance decreases with increasing Tm concentration and it falls into the range where cross relaxation phenom- [Tm 3+ ] N × 10 20 (cm −3 )r (nm) R C (nm) Therefore, at higher thulium concentrations the quenching phenomenon takes place because the Tm-Tm distances decrease and this favors the cross-relaxation mechanisms [34][35][36]. Table 7 summarizes the decay time studied, the luminescence quantum efficiency η (η = τ/τ rad ) and the cross relaxation rates W E , by W E = 1/τ − 1/τ rad (assuming multiphonon decay did not act as a depopulation mechanism) [37].…”

Crystal growth and spectroscopic characterization ofTm3+-dopedKYb(WOPujol1, Güell2, Mateos3 et al. 2002Phys. Rev. B41380View full textAdd to dashboardCite

“…The usual laser transitions of thulium are infrared emission at 1.8 m ( 3 F 4 → 3 H 6 transition, energy Х5900-5000 cm Ϫ1 , Х1.7-2 m), which has applications in medicine and remote sensing, and blue visible emission at 450 nm ( 1 D 2 → 3 F 4 transition, energy Х22 727-21 275 cm Ϫ1 , Х440-470 nm). 1 Thulium transition at 1.5 m ( 3 H 4 → 3 F 4 transition, energy Х6760-6475 cm Ϫ1 , Х1.48-1.54 m) is also interesting because of its eye-safe region and optical communications due to the third optical transmission window of the silica fibers. Laser action at 1.5 m of thulium ion has been realised by sensitization with Yb in YLF fibres after excitation by diode and YAG:Nd 3ϩ pumping.…”