Absorption and emission characteristics of Er3+ ions in alkali chloroborophosphate glasses.
Alkali chloroborophosphate glasses containing 1 mol% of Er3+ ions were studied experimentally using the absorption and emission spectroscopy. The energy level scheme for the 4f11 (Er3+) electronic configuration was deduced from the observed band energies of the absorption spectra in terms of a parametrized Hamiltonian using the various free-ion spectroscopic parameters. Oscillator strengths (f) measured from the absorption spectra have been analyzed using the Judd-Ofelt theory to evaluate the three intensity parameters omegalambda (lambda = 2, 4 and 6). Reasonable agreement between the measured and calculated f values has been found. Electric and magnetic dipole transition probabilities, fluorescence branching ratios, integrated emission cross sections and radiative lifetimes were calculated for all the excited states of Er3+ ions. The non-radiative (WNR) relaxation rates from the excited levels to the next lower levels have been calculated and the relationship between the energy gap and non-radiative relaxation rate has been established. These results were used to predict the possible potential laser transitions in Er-doped alkali chloroborophosphate glasses.
Moorthy
L R
LR
Department of Physics, Sri Venkateswara University, Tirupati, India. lrmoorthy@usa.net
Rao
T S
TS
Janardhnam
K
K
Radhapathy
A
A
D004871:Erbium / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D008956:Models, Chemical; D013054:Spectrophotometry, Atomic / Q000379:methods*
D004871:Erbium