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- W174470147 abstract "Persistent spectral hole burning in the $fensuremath{rightarrow}f$ transition and changes in the $fensuremath{rightarrow}d$ transition spectra upon laser irradiation were investigated in ${mathrm{Sm}}^{2+}$-doped ${mathrm{Al}}_{2}{mathrm{O}}_{3}{ensuremath{-}mathrm{S}mathrm{i}mathrm{O}}_{2}$ glasses prepared by a sol-gel process. The hole was burned in the ${}^{7}{F}_{0}{ensuremath{rightarrow}}^{5}{D}_{0}$ line of ${mathrm{Sm}}^{2+}$ ions using a DCM dye laser at 77 K and the dependence of the burning efficiency on laser power and burning time was measured. The hole depth increased with increasing laser irradiation time, reaching up to $ensuremath{sim}12%$ of the total intensity within a few hundred seconds. Neither an antihole around the burned hole nor a change in the fluorescence line narrowing spectrum were observed after hole burning. The hole depth linearly increased with increasing the incident laser power up to $ensuremath{sim}1{mathrm{W}/mathrm{m}mathrm{m}}^{2},$ indicating a single-photon hole-burning process. On the other hand, laser irradiation with a wavelength corresponding to the energy of the ${4f}^{6}ensuremath{rightarrow}{4f}^{5}5d$ transition resulted in a decrease of both the absorption and fluorescence intensities but no formation of a hole. It was concluded that the electrons excited in the ${4f}^{5}5d$ level were further excited into the conduction band of the host matrix by a two-photon absorption process and then captured in the trapping center." @default.
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- W174470147 date "1997-07-01" @default.
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- W174470147 title "Spectral hole burning and excited electrons in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant=normal>Sm</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>-doped<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Al</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:…" @default.
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- W174470147 doi "https://doi.org/10.1103/physrevb.56.182" @default.
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