• C K Jayasankar

      Articles written in Pramana – Journal of Physics

    • Optical absorption spectra of tripositive erbium ion in certain nitrate complexes

      S V J Lakshman C K Jayasankar

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      Optical absorption of Er3+ ion in Er(NO3)3·5H2O, NH4NO3, Mg(NO3)2·6H2O, KNO3 and NaNO3 complexes has been studied. The second derivative spectra of these Er3+ complexes exhibited splittings in the4I9/2,4F9/2,4F7/2,4F5/2 and2H9/2 levels. These splittings have been tentatively explained as due to a cubic crystalline field. The partial derivatives for Er3+ ion have been calculated in terms of Racah (Ek) parameters. The results of a least squares fit of the energy levels and oscillator strengths of the bands are reported in terms of interaction parameters and Judd-Ofelt parameters. Radiative transition probabilities for various fluorescence levels are theoretically estimated. The lifetime of the4G11/2 level is found to be lowest in all nitrate complexes.

    • Spectroscopic properties of Er3+ ions in cadmium and alkali cadmium borosulphate glasses

      C K Jayasankar V V Ravi Kanth Kumar

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      Spectroscopic properties of Er3+:CBS (CdSO4+B2O3 and R2SO4+CdSO4+B2O3, R2SO4=Li2SO4.H2O, Na2SO4, K2SO4 and Gd2(SO4)3.8H2O) glasses are reported. The assigned energy level data of Er3+(4f11) in these glasses are analysed in terms of a parametrized model Hamiltonian. The standard deviations of the data fits are between 39 and 47 cm−1 so that the energy level schemes of the Er3+(4f11) ions in borosulphate (CBS) glasses are reasonably well reproduced. Radiative properties for the fluorescent levels of Er3+:CBS glasses are determined by using the Judd-Ofelt theory. The potential laser transitions are identified with the help of predicted radiative properties which are compared and discussed with similar results.

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