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Journal of Optical Technology

Stimulated emission of Co^2+ ions in transparent glass-ceramics

Yu.V. Volk, Alexander M. Malyarevich, Konstantin V. Yumashev, Olga S. Dymshits, Alexander A. Zhilin, G. T. Petrovskiĭ, A. V. Shashkin

Published Sep 1, 2006• 0 citations
Publisher

Abstract

This paper investigates the differential absorption spectra of a number of transparent spinel-based cobalt-containing aluminosilicate glass-ceramics in the 550-700-nm range. A stimulated emission band accompanying transitions between the 4T1(4P) and 4A2 levels of the tetracoordinated Co2+ ion is detected in all the materials. Depending on the composition of the glass-ceramic, the effective stimulated-emission cross sections of the Co2+ ions at the maximum of this band are estimated at (4-5)×10−19 cm2.

DOI
10.1364/jot.73.000584

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This paper investigates the differential absorption spectra of a number of transparent spinel-based cobalt-containing aluminosilicate glass-ceramics in the 550-700-nm range. A stimulated emission band accompanying transitions between the 4T1(4P) and 4A2 levels of the tetracoordinated Co2+ ion is detected in all the materials. Depending on the composition of the glass-ceramic, the effective stimulated-emission cross sections of the Co2+ ions at the maximum of this band are estimated at (4-5)×10−19 cm2.
The absorption spectrum of Cr3+ ions in the magnesium spinel MgAl2O4 was determined for crystals excited by strong optical pumping, and for unexcited crystals. The absorption cross section of the 4A2g level was found to be 2.5 10–20 cm2, which was an order of magnitude smaller than that for ruby. The spectrum obtained for the excited crystals consisted of five absorption bands with maxima at 250, 325, 390, 440, and 550 nm. The absorption cross section for the maximum of the first band was ~2 10–18 cm2. The absorption cross sections at the maxima of the other bands were (1 – 2.5) 10–20 cm2. An energy scheme for Cr3+ ions in MgAl2O4 was derived.
Infrared fluorescence and phonon-terminated stimulated emission from V2+ ions in MgF2 is reported. Fluorescence is produced in transitions from the first excited state 4T2(4F) to the ground state 4A2(4F). Stimulated emission occurs in the vibronic sideband at 1.1217 μ (8915 cm−1) and lies 1166 cm−1 from the no-phonon line. A gain curve calculated from the optical spectra predicts an oscillation frequency in reasonable agreement with the observed frequency, with a cross section for stimulated emission of 8×10−21 cm2. From the effect of excited state absorption on the gain profile it is concluded that the excited state absorption cross section at the maser frequency is <3×10−21 cm2.
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.
Optical dephasing of Pr3+ and Tm3+ ions doped in transparent oxyfluoride glass ceramics was studied with the two-pulse photon echo technique. It was found that the dephasing time of rare earth ions is dramatically less in nanocrystals embedded in a glass matrix than in bulk crystals. A quasi-linear temperature dependence obtained at low temperatures proved that the long-range interaction of the ions inside the nanocrystals with the two level systems of the glass matrix dominates the optical dephasing. The local thermal effect in glass ceramics containing nanocrystals elevates the local temperature, which results in the reduction of optical dephasing time. For Tm(3+)-doped glass ceramics, the elevation of local temperature induced by the irradiation of excitation laser even quenched the photon echo signals in the experimental study.