Journal of Applied Physics

Persistent spectral hole burning studies of europium-doped sodium germanate glass

Rajamohan R. Kalluru, Chandra R. Pulluru, Bommareddi Rami Reddy

Published Sep 27, 2004• 8 citations

Abstract

Persistent spectral hole burning has been observed in europium-doped sodium germanate glass. Hole-burning efficiency increased by 85% when the glasses were made in a reduced atmosphere, and hole burning was detected even at room temperature. There is evidence for photochemical as well as photophysical hole-burning mechanisms.

DOI: 10.1063/1.1787908

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Journal of Applied Physics

Persistent spectral hole burning studies of europium-doped sodium germanate glass

Rajamohan R. Kalluru, Chandra R. Pulluru, Bommareddi Rami Reddy

Published Sep 27, 2004• 8 citations

Publisher

Abstract

DOI: 10.1063/1.1787908

Related papers

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Physical review. B, Condensed matterDec 1, 199457 citations

Persistent and time-resolved transient holes were burnt into the

^{1}\mathrm{D}_{2}

${\ensuremath{\leftarrow}}^{3}$

{\mathrm{H}}_{4}

transition of

{\mathrm{Pr}}^{3+}

and the

^{5}\mathrm{D}_{0}

${\ensuremath{\leftarrow}}^{7}$

{\mathrm{F}}_{0}

transition of

{\mathrm{Eu}}^{3+}

in silicate glasses. The holewidths were studied as a function of burning-fluence density, wavelength, and temperature between 0.4 and 12 K. Transient holes arising from optical pumping of ground-state nuclear hyperfine levels were found for both ions at T3 K. Their lifetime decreases with increasing temperature. They are accompanied by symmetrically placed antiholes. For

{\mathrm{Eu}}^{3+}

, two pairs of antiholes were found which are attributed to the two europium isotopes,

^{151}\mathrm{Eu}

and

^{153}\mathrm{Eu}

. For

{\mathrm{Pr}}^{3+}

, an additional mechanism leading to persistent hole burning dominates above 3 K. The holewidth follows a ${\mathit{T}}^{(1.3\ifmmode\pm\else\textpm\fi{}0.1)}$ dependence for

{\mathrm{Pr}}^{3+}

and a ${\mathit{T}}^{(1.0\ifmmode\pm\else\textpm\fi{}0.1)}$ dependence for

{\mathrm{Eu}}^{3+}

. The temperature dependence is the same as that of the contribution of the two-level systems to the specific heat measured on the same samples and in the same temperature range. The quadrupole splittings of the

^{7}\mathrm{F}_{0}

ground state and the crystal-field splittings of the

^{7}\mathrm{F}_{1}

and

^{7}\mathrm{F}_{2}

levels of

{\mathrm{Eu}}^{3+}

as a function of excitation wavelength indicate that the strength of the noncubic component of the crystal field varies monotonically for excitation across the

^{5}\mathrm{D}_{0}

${\ensuremath{\leftarrow}}^{7}$

{\mathrm{F}}_{0}

absorption band, falling to zero at the long-wavelength edge. The hole width shows a similar variation with excitation frequency. No influence of the experimental time scale on the hole width was detected for either sample between ${10}^{\mathrm{\ensuremath{-}}2}$ and

{10}^{2}