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Journal of Optical Technology

How the ytterbium concentration affects the population inversion of erbium in phosphate laser glasses

Vladimir A. Aseev, M. N. Zhukova, А. С. Златов, Н. В. Никоноров, Alexander K. Przhevuskii, Yu. K. Fedorov

Published Nov 1, 2007• 1 citation
Publisher

Abstract

The population of the metastable level of erbium in ytterbium-erbium phosphate glasses has been measured as a function of the concentration of ytterbium ions and the power of the laser pumping. The ytterbium concentration was varied from 0 to a limiting value of 52.4×1020cm−3. It is established that increasing the concentration of ytterbium ions causes the population inversion of erbium to increase.

DOI
10.1364/jot.74.000769

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The population of the metastable level of erbium in ytterbium-erbium phosphate glasses has been measured as a function of the concentration of ytterbium ions and the power of the laser pumping. The ytterbium concentration was varied from 0 to a limiting value of 52.4×1020cm−3. It is established that increasing the concentration of ytterbium ions causes the population inversion of erbium to increase.
An analysis is made of some processes that occur under conditions of accumulation of population inversion due to the 4 I 13/2 – 4 I 15/2 resonant transition in Er 3+ ions in ytterbium–erbium (Yb–Er) glasses of various compositions. Methods of measuring the parameters of direct and reverse excitation energy transfer between Er 3+ and Yb 3+ ions are also studied. It is found that, under certain conditions achieved in practice, appreciable bleaching of the medium should be observed at the frequency of the pump radiation, particularly under conditions of high-intensity reverse transfer of excitation energy from Er 3+ to Yb 3+ ions. This is typical of glasses having a low rate of intracenter relaxation of Er 3+ ions. It is also shown that nonsteady-state rate equations that assume a linear relationship between the rate of interionic transfer and the ground state population of the acceptor consistently describe the energy characteristics of the excitation processes of Yb–Er glasses. In this case, it is not necessary to introduce in the calculation model additional excitation losses that increase nonlinearly with the pump radiation.
Characteristics of ytterbium to erbium energy transfer in Yb:Er:phosphate glasses have been studied for a case when Nd phosphate glass laser is used as a pumping source. A theoretical model of the energy transfer was developed to reproduce the experimentally observed population dynamics of the Er/sup 3+/ upper and lower laser levels. The results show that saturation and frequency hole burning of the inhomogeneously broadened Yb/sup 3+/ absorption line are of primary importance in determining the dynamics and efficiency of the Yb/sup 3+/-Er/sup 3+/ energy transfer under Nd laser pumping. The influence of other loss channels that have been identified in previous studies is found to be relatively small. The model also yields the lifetime of the frequency hole, as well as the effective rates of energy transfer between groups of Yb/sup 3+/ and Er/sup 3+/ ions in phosphate glasses.>
A calculation is reported of the energy parameters of stimulated emission of λ = 1.54 μ. radiation from glasses activated with Yb 3+ and Er 3+ ions and pumped with neodymium laser radiation. The calculation allows for the influence of the induced absorption at the pump wavelength and for the quenching of the excited levels of the Yb 3+ and Er 3+ ions. The kinetics and magnitude of the induced absorption are investigated for glasses of various compositions containing Yb 3+ and Er 3+ . The calculated values of the energy parameters are compared with the experimental results. Some features of the stimulated emission spectra of erbium-activated phosphate glasses are considered.