Spectroscopic properties of Nd3+ ions in phoshate glasses

Luminescence characteristics of Nd3+-doped K–Ba–Al-fluorophosphate laser glasses

“…4). This concentration dependent quenching of lifetime is attributed to the increase in energy transfer processes between Nd 3+ ions through one of the cross-relaxation channels: 4 F 3/2 + 4 I 9/2 → 4 I 15/2 + 4 I 15/2 or 4 F 3/2 + 4 I 9/2 → 4 I 13/2 + 4 I 15/2 [11,12]. The non-exponential decay curves of PKFBAN10 and PKFBAN20 glasses have been well-fitted to the Inokuti-Hirayama (I-H) model [13] for S = 6 indicating that the nature of interaction for energy transfer processes between Nd 3+ ions is of dipole-dipole type.…”

Concentration quenching in erbium-doped tellurite glasses

“…4 is independent of Er influence, the value of N q varies with various OH À contents even under the same composition, moreover, the value of N q is much larger in glasses with a higher concentration of OH À groups than in glasses with lower OH À concentration [23]. Therefore, the effect of Er 3+ concentration in tellurite glass on the fluorescence quenching of the 4 I 13/2 level in the absence of OH groups needs to be researched further.…”

Neodymium fluorescence quenching by hydroxyl groups in phosphate laser glasses

“…The upper laser level for Nd 3+ is the metastable 4 F 3/2 state and the rate of energy transfer from this state is given by the inverse of the fluorescence lifetime (s À1 f ) [10,[13][14][15]. Hydroxyl groups reduce the lifetime (increase the decay rate) [1,10,12,15] and thereby reduce the stored energy in the 4 F 3/2 state, resulting in a corresponding degradation in the laser output energy. Phosphate glass hosts are particularly vulnerable to OH contamination because they tend to absorb water readily during melting [3,16].…”

“…One factor that degrades the performance of Nddoped laser glasses is OH impurities [1,[10][11][12]. The upper laser level for Nd 3+ is the metastable 4 F 3/2 state and the rate of energy transfer from this state is given by the inverse of the fluorescence lifetime (s À1 f ) [10,[13][14][15].…”