Zinc lithium calcium potassiumniobate phosphate glasses containing Er3+ in (45-x): P2O5:10ZnO:10Li2O:10CaO:10K2O:15Nb2O5:xEr2O3. (where x=1, 1.5,2 mol %) have been prepared by melt-quenching method. The amorphous nature of the glasses was confirmed by x-ray diffraction studies. Optical absorption, Excitation, and fluorescence spectra were recorded at room temperature for all glass samples. Judd-Ofelt intensity parameters ?? (?=2, 4, 6) are evaluated from the intensities of various absorption bands of optical absorption spectra. Using these intensity parameters various radiative properties like spontaneous emission probability, branching ratio, radiative life time and stimulated emission cross–section of various emission lines have been evaluated.
Rare-earth ions doped glass-ceramics are important materials for optical fibers, wave guide lasers, sensors and optical amplifiers [1-5].Oxide glasses are the most stable host matrices for practical applications due to their high chemical durability and thermal stability[6-10].Phosphate glasses are extremely attractive materials for linear and non-linear application in optics, due to their important aspects such as their low melting temperature, low phonon energy, high refractive index, high dielectric constant, good chemical durability, high thermal stability, good solubility of rare earth ions[11-16].The addition of heavy metal oxide to phosphate glasses decreases the phonon energy. Thus, leads to increase in its quantum efficiency of luminescence from the exited state of rare earth ions .Er3+ doped rare earth doped glasses considerable literature has recently emerged concerning the structure, optical, mechanical, thermal, and electrical properties [17-20].
In this work, the spectroscopic properties of Er3+ -doped (45-x): P2O5:10ZnO:10Li2O:10CaO:10K2O:15Nb2O5:xEr2O3 (where x=1, 1.5,2 mol %) glasses were investigated. The Optical absorption,Excitation and fluorescence spectra of Er3+ of the glasses were investigated. The intensities of the transitions for the rare earth ions have been estimated successfully using the Judd-Ofelt theory, The laser parameters such as radiative probabilities(A),branching ratio (β), radiative life time(τR) and stimulated emission cross section(σp) are evaluated using J.O.intensity parameters( Ωλ, λ=2,4 and 6).
II. EXPERIMENTAL TECHNIQUES
A. Preparation of Glasses
The following Er3+ doped zinc lithium calcium potassiumniobate phosphate glass samples (45-x): P2O5:10ZnO:10Li2O:10CaO:10K2O:15Nb2O5:xEr2O3 (where x=1, 1.5.2) have been prepared by melt-quenching method. Analytical reagent grade chemical used in the present study consist of P2O5, ZnO, Li2O, CaO, K2O, Nb2O5 and Er2O3. All weighed chemicals were powdered by using an Agate pestle mortar and mixed thoroughly before each batch (10g) was melted in alumina crucibles in silicon carbide based an electrical furnace.
Silicon Carbide Muffle furnace was heated to working temperature of 10700C, for preparation of zinc lithium calcium potassiumniobate phosphate glasses, for two hours to ensure the melt to be free from gases. The melt was stirred several times to ensure homogeneity. For quenching, the melt was quickly poured on the steel plate & was immediately inserted in the muffle furnace for annealing. The steel plate was preheated to1000C.While pouring; the temperature of crucible was also maintained to prevent crystallization. And annealed at temperature of 3500C for 2h to remove thermal strains and stresses. Every time fine powder of cerium oxide was used for polishing the samples. The glass samples so prepared were of good optical quality and were transparent. The chemical compositions of the glasses with the name of samples are summarized in Table 1
In the present study, the glass samples of composition (45-x): P2O5:10ZnO:10Li2O:10CaO:10K2O:15Nb2O5:xEr2O3 (where x =1, 1.5, 2 mol %) have been prepared by melt-quenching method. The value of stimulated emission cross-section (?p) is found to be maximum for the transition (4F7/2?4I15/2) for glass ZLCPNP (ER 01), suggesting that glass ZLCPNP (ER 01) is better compared to the other two glass systems ZLCPNP (ER1.5) and ZLCPNP (ER02).
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