Optical absorption and emission properties of Pr3+Pr^{3+} and Er3+Er^{3+} in lithium cesium mixed alkali borate glasses

This article presents the optical absorption and emission properties of $Pr^{3+}$ and $Er^{3+}$ in mixed alkali borate glasses of the type $68B_2O_3{\cdot}xLi_2O{\cdot}(32-x)Cs_2O$ (where x=8, 12, 16, 20 and 24). The variation of Judd–Ofelt intensity parameters $(\Omega_{\lambda})$, the peak wavelength of the hypersensitive transitions, radiative transition probabilities $(A_{rad})$ and peak emission cross-sections $({\sigma}_p)$ with x in the glass matrix have been discussed in detail. The changes in position of hypersensitive transition and intensity parameters with x are correlated to the structural changes in the host matrix. The estimated radiative lifetimes $(\tau_R)$ of certain excited states of both $Pr^{3+}$ and $Er^{3+}$ in lithium cesium mixed alkali borate glasses are reported. Branching ratios $(\beta)$ and integrated absorption cross-sections $(\Sigma)$ for certain important transitions are presented. Peak stimulated emission cross-sections $(\sigma_p)$ are calculated for the observed emission peaks of $Pr^{3+}$ and $Er^{3+}$ ions in this glass matrix

Optical absorption and emission properties of Pr3+Pr^{3+} and Er3+Er^{3+} in mixed alkali borate glasses

his article presents the optical absorption and emission properties of $Pr^{3+}$ and $Er^{3+}$ in mixed alkali borate glasses of the type $68B_2O_3.xLi_2O.(32-x)Cs_2O$ (where x= 8, 12, 16, 20 and 24 ). The variation of Judd-Ofelt intensity parameters $(\Omega_{\lambda})$, the peak wavelength of the hypersensitive transitions, radiative transition probabilities $(A_{rad})$ and peak emission cross-sections $(\sigma_p)$ with x in the glass matrix has been discussed in detail. The changes in position of hypersensitive transition and intensity parameters with x are correlated to the structural changes in the host matrix. The estimated radiative lifetimes $(\tau_R)$ of certain excited states of both $Pr^{3+}$ and $Er^{3+}$ in lithium cesium mixed alkali borate glasses are reported. Branching ratios $(\beta)$ and integrated absorption cross sections $(\Sigma)$ for certain important transitions are presented. Peak stimulated emission cross-sections $(\sigma_p)$ are calculated for the observed emission peaks of $Pr^{3+}$ and $Er^{3+}$ ions in this glass matrix

Optical absorption and emission properties of Pr3+Pr^{3+} and Er3+Er^{3+} in lithium cesium mixed alkali borate glasses

This article presents the optical absorption and emission properties of $Pr^{3+}$ and $Er^{3+}$ in mixed alkali borate glasses of the type $68B_2O_3{\cdot}xLi_2O{\cdot}(32-x)Cs_2O$ (where x=8, 12, 16, 20 and 24). The variation of Judd–Ofelt intensity parameters $(\Omega_{\lambda})$, the peak wavelength of the hypersensitive transitions, radiative transition probabilities $(A_{rad})$ and peak emission cross-sections $({\sigma}_p)$ with x in the glass matrix have been discussed in detail. The changes in position of hypersensitive transition and intensity parameters with x are correlated to the structural changes in the host matrix. The estimated radiative lifetimes $(\tau_R)$ of certain excited states of both $Pr^{3+}$ and $Er^{3+}$ in lithium cesium mixed alkali borate glasses are reported. Branching ratios $(\beta)$ and integrated absorption cross-sections $(\Sigma)$ for certain important transitions are presented. Peak stimulated emission cross-sections $(\sigma_p)$ are calculated for the observed emission peaks of $Pr^{3+}$ and $Er^{3+}$ ions in this glass matrix

Spectral studies of Sm3+Sm^{3+} and Dy3+Dy^{3+} doped lithium cesium mixed alkali borate glasses

The effect of host glass composition on the optical absorption and fluorescence spectra of $Sm^{3+}$ and $Dy^{3+}$ has been studied in mixed alkali borate glasses of the type $67B_2O_3{\cdot}xLi_2O{\cdot}(32-x)Cs_2O$ (x=8, 12, 16, 20 and 24). The Judd-Ofelt intensity parameters $(\Omega_2, \Omega_4\hspace{2mm}and\hspace{2mm}\Omega_6)$ are calculated. The radiative transition probabilities (A), radiative lifetimes $(\tau_R)$, branching ratios $(\beta)$ and integrated absorption cross sections $(\Sigma)$ are computed for certain excited states of $Sm^{3+}$ and $Dy^{3+}$ ions for different x values in the glass matrix. Stimulated emission cross sections (sp) are obtained for certain emission transitions of two ions in these mixed alkali borate glasses. These parameters are compared for different x values in the glass matrix. Variation of these parameters with x in the glass matrix has been studied

Electronic absorption spectra and energy gap studies of Er3+ ions in different chlorophosphate glasses

Spectroscopic properties of Er3+ ions in different chlorophosphate glasses 50P2O5-30Na2HPO4-19.8RCl (R=Li, Na, K, Ca and Pb) are studied. The direct and indirect optical band gaps (Eopt) and the various spectroscopic parameters (E1, E2, E3, and \xi 4f and \alpha ) are reported. The oscillator strengths of the transitions in the absorption spectrum are parameterized in terms of three Judd-Ofelt intensity parameters (\Omega 2, \Omega 4 and \Omega 6). These intensity parameters are used to predict the transition probabilities (A), radiative lifetimes (\tau R), branching ratios (\beta) and integrated cross sections (\Sigma) for stimulated emission. Attention has been paid to the trend of the intensity parameters over hypersensitive transitions and optical band gaps. The lifetimes and branching ratios of certain transitions are compared with other glass matrices

Electronic Spectra of Pr^3^+ Doped Mixed Alkali Borate Glasses

An investigation of the optical absorption spectra of 1 mol% $Pr_2O_3$ in mixed alkali borate glasses of the type $xNa_2O. (30-x) K_2O.69B_2O_3. 1Pr_2O_3$ (x=5,10,15,20 and 25) is presented

Absorption and emission properties of Nd3+Nd^{3+} in lithium cesium mixed alkali borate glasses

Lithium cesium mixed alkali borate glasses of the composition $67B_{2}O_{3}.xLi_{2}O.(32-x)Cs_{2}O$ (where xZ8, 12, 16, 20 and 24) containing 1 mol% $Nd_{2}O_{3}$ were prepared by melt quenching. The absorption spectra of $Nd^{3+}C$ were studied from the experimental oscillator strengths and the Judd–Ofelt intensity parameters were obtained. The intensity parameters are used to determine the radiative decay rates (emission probabilities of transitions) $(A_{T})$, branching ratios (\beta) and integrated absorption cross-sections (\Sigma) of the $Nd_{3+}$ transitions from the excited state J manifolds to the lower lying J manifolds. Radiative lifetimes (\tua_{R}) are estimated for certain excited states of $Nd^{3+}C$ in these mixed alkali borate glasses. Luminescence spectra were measured and the emission cross-sections $(\sigma_{p})$ were evaluated for the three emission transitions. The variation of luminescence intensity with x was recorded for the three transitions at different excitation power to see the effect of mixed alkalies in these borate glasses

Spectral studies of Sm3+Sm^{3+} and Dy3+Dy^{3+} doped lithium cesium mixed alkali borate glasses

The effect of host glass composition on the optical absorption and fluorescence spectra of $Sm^{3+}$ and $Dy^{3+}$ has been studied in mixed alkali borate glasses of the type $67B_2O_3{\cdot}xLi_2O{\cdot}(32-x)Cs_2O$ (x=8, 12, 16, 20 and 24). The Judd-Ofelt intensity parameters $(\Omega_2, \Omega_4\hspace{2mm}and\hspace{2mm}\Omega_6)$ are calculated. The radiative transition probabilities (A), radiative lifetimes $(\tau_R)$, branching ratios $(\beta)$ and integrated absorption cross sections $(\Sigma)$ are computed for certain excited states of $Sm^{3+}$ and $Dy^{3+}$ ions for different x values in the glass matrix. Stimulated emission cross sections (sp) are obtained for certain emission transitions of two ions in these mixed alkali borate glasses. These parameters are compared for different x values in the glass matrix. Variation of these parameters with x in the glass matrix has been studied

Characterization of Tm3+ Doped Mixed Alkali Borate Glasses- Spectroscopic Investigation

The effect of mixed alkalis on the optical absorption spectra of Tm^3^+ in $xNa_2O.(30-x) K_2O.70B_2O_3$ (x=5,10,15,20 and 25) glasses has been studied

Electronic spectra of Pr^3^+ doped mixed alkali borate glasses.

An investigation of the optical absorption spectra of 1 mol% $Pr_2O_3$ in mixed alkali borate glasses of the type $xNa_2O.(30-x)K_2O.69B_2O_3.1Pr_2O_3$ (x=5, 10, 15, 20 and 25) is presented. The glasses were obtained by quenching melts consisting of $Na_2CO_3, K_2CO_3, H_3BO_3 and Pr_2O_3$(850-1000 Deg C, 1.5-2 h) between brass plates. Spectroscopic parameters like Racah $(E^1, E^2 and E^3)$ and spin orbit ( \xi 4f) interaction parameters and Judd-Ofelt intensity parameters (\Omega 2,\Omega4 and \Omega 6) have been calculated as a function of x in the glass matrix. Radiative and nonradiative transition rates (A_T and W_M_P_R), radiative lifetimes $( \tau _R)$, branching ratios (\beta) and integrated absorption cross sections (\Sigma) are reported for certain excited states of Pr^3^+ in all glasses studied. Variations of these parameters as a function of composition are discussed in terms of covalency and of changes into the crystal field around the Pr^3^+ ions caused by structural changes of the glass matrix