The effect of host glass on optical absorption and fluorescence of Nd³⁺inxNa₂O–(30 x)K₂O–70B₂O₃glasses

Abstract

The effect of host glass composition on the optical absorption and fluorescence spectra of Nd 3+ has been studied in mixed alkali borate glasses of the type 5, 10, 15, 20 and 25). Various spectroscopic parameters such as Racah (E 1 , E 2 and E 3 ), spin-orbit (ξ 4f ) and configuration interaction (α, β) parameters have been calculated. The Judd-Ofelt intensity parameters ( λ ) have been calculated and the radiative transition probabilities (A rad ), radiative lifetimes (τ r ), branching ratios (β) and integrated absorption cross sections ( ) have been obtained for certain excited states of the Nd 3+ ion and are discussed with respect to x. From the fluorescence spectra, the effective fluorescence line widths ( λ eff ) and stimulated emission cross sections (σ p ) have been obtained for the three transitions 4 F 3/2 → 4 I 9/2 , 4 F 3/2 → 4 I 11/2 and 4 F 3/2 → 4 I 13/2 of Nd 3+ . The stimulated emission cross section (σ p ) values are found to be in the range (2.0-4.8) × 10 −20 cm 2 and they are large enough to indicate that the mixed alkali borate glasses could be potential laser host materials.

Optical absorption and luminescence properties of Nd3+ in mixed alkali borate glasses—Spectroscopic investigations

“…The details of preparation of these glasses were given in the authors earlier article [17]. The samples examined in the present work are…”

“…Table 5 gives peak wavelengths (l P ), radiative transition probabilities (A rad ), effective linewidths (Dl eff ) and stimulated emission cross-sections (s p ) of 4 F 3/2 -4 I 13/2 , 4 F 3/2 -4 I 11/2 and 4 F 3/2 -4 I 9/2 CW laser action. These values for 4 F 3/2 -4 I 11/2 transition are high for lithium sodium and lithium potassium glasses when compared with sodium potassium glass [17]. It is also observed that s p value increases when the third component is added to the glass matrix [26].…”

“…Chong et al [16] showed that mixed alkali borate glasses have structures that are quite similar to the binary borate glasses. In the recent past, we have studied the spectroscopic investigations of Nd 3+ in (Na 2 O) x (K 2 O) 30Àx (B 2 O 3 ) 70 (x=5, 10, 15, 20 and 25) glasses and also influence of Nd 3+ concentration on its optical absorption and luminescence properties in potassium borate glass [17,18].…”

Judd–Ofelt analysis of spectroscopic properties of Nd3+-doped novel fluorophosphate glass

“…The stimulated emission cross-section between 4 F 3/2 -4 I J 0 having measured fluorescence lifetime (t f ) is given as below [24] s em ¼ l 4 p 8pcn l p À Á 2 Dl eff A½ðaJÞ; ðaJ 0 Þ,…”

Effect of Nd3 + concentration on the physical and absorption properties of sodium-lead-borate glasses

“…Large stimulated emission cross sections have been reported [9] stressing the suitability of different Nd 3+ doped lead borate and bismuth borate glasses for laser action. Studies of NMR and fluorescence of Nd 3+ doped binary alkali borate glasses have also been published [10,11]. However, to the best of our knowledge, rare earth doped alkali lead borate glasses have not been studied in any great detail.…”