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| Description
| - Erbium ions are known to have good fluorescence properties in the mid-infrared spectral region near 3 um. That is why the investigation of fluorescence properties of Er3+ ions at the 4I11/2-4I13/2 mid-IR transition in recently developed CaF2:Er3+ high-optical-quality ceramics is of interest. The decay curves of Er3+ ions in CaF2 ceramics (Er3+ concentration of 5.5%) were measured for 4I11/2 and 4I13/2 electronic levels involved in mid IR lasing for low excitation intensities. The lifetime of the lower 4I13/2 level (13 ms) is about 1.5 times longer than that for the upper 4I11/2 level (8.5 ms). To investigate cross-relaxation channels depopulating the lower 4I13/2 level for 3 um laser operation, direct excitation of 4I13/2 by an Er:glass laser (1.53 um) was applied. The measured fluorescence up-conversion spectra for CaF2:Er3+ ceramics in visible and near-infrared spectral range were measured depending on excitation energy. It was demonstrated that for obtaining near-IR (990 nm) fluorescence, only single-stage cross-relaxation process is required, while excitation of higher levels responsible for the red (660 nm) and green (550 nm) fluorescence can arise only from two successive cross-relaxation processes. As a result, a quadratic dependence on the excitation intensity was observed. To obtain blue (400 nm) fluorescence, three successive cross-relaxation processes was required and a cubic dependence of the fluorescence intensity on excitation was observed. The lasing properties of Er3+ doped CaF2 fluoride ceramics were also investigated using pulsed laser diode excitation at 968 nm (pulse repetition rate 20 Hz, pulse width 3 ms). Laser emission at wavelength 2737 nm was achieved. The input-output characteristics of CaF2:Er3+ ceramics were measured; the output energy up to 0.8 mJ was obtained for 34 mJ absorbed pumping energy.
- Erbium ions are known to have good fluorescence properties in the mid-infrared spectral region near 3 um. That is why the investigation of fluorescence properties of Er3+ ions at the 4I11/2-4I13/2 mid-IR transition in recently developed CaF2:Er3+ high-optical-quality ceramics is of interest. The decay curves of Er3+ ions in CaF2 ceramics (Er3+ concentration of 5.5%) were measured for 4I11/2 and 4I13/2 electronic levels involved in mid IR lasing for low excitation intensities. The lifetime of the lower 4I13/2 level (13 ms) is about 1.5 times longer than that for the upper 4I11/2 level (8.5 ms). To investigate cross-relaxation channels depopulating the lower 4I13/2 level for 3 um laser operation, direct excitation of 4I13/2 by an Er:glass laser (1.53 um) was applied. The measured fluorescence up-conversion spectra for CaF2:Er3+ ceramics in visible and near-infrared spectral range were measured depending on excitation energy. It was demonstrated that for obtaining near-IR (990 nm) fluorescence, only single-stage cross-relaxation process is required, while excitation of higher levels responsible for the red (660 nm) and green (550 nm) fluorescence can arise only from two successive cross-relaxation processes. As a result, a quadratic dependence on the excitation intensity was observed. To obtain blue (400 nm) fluorescence, three successive cross-relaxation processes was required and a cubic dependence of the fluorescence intensity on excitation was observed. The lasing properties of Er3+ doped CaF2 fluoride ceramics were also investigated using pulsed laser diode excitation at 968 nm (pulse repetition rate 20 Hz, pulse width 3 ms). Laser emission at wavelength 2737 nm was achieved. The input-output characteristics of CaF2:Er3+ ceramics were measured; the output energy up to 0.8 mJ was obtained for 34 mJ absorbed pumping energy. (en)
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| Title
| - Spectroscopics and Laser Properties of Er3+-doped Fluoride Laser Ceramics
- Spectroscopics and Laser Properties of Er3+-doped Fluoride Laser Ceramics (en)
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| skos:prefLabel
| - Spectroscopics and Laser Properties of Er3+-doped Fluoride Laser Ceramics
- Spectroscopics and Laser Properties of Er3+-doped Fluoride Laser Ceramics (en)
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| skos:notation
| - RIV/68407700:21340/13:00209521!RIV14-GA0-21340___
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| http://linked.open...avai/predkladatel
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
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| http://linked.open...ai/riv/idVysledku
| - RIV/68407700:21340/13:00209521
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| http://linked.open...riv/jazykVysledku
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| http://linked.open.../riv/klicovaSlova
| - Er:CaF2; ceramics; up-conversion processes; mid-infrared solid state laser; diode pumping (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...in/vavai/riv/obor
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| http://linked.open...ichTvurcuVysledku
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| http://linked.open...cetTvurcuVysledku
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| http://linked.open...vavai/riv/projekt
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| http://linked.open...UplatneniVysledku
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| http://linked.open...iv/tvurceVysledku
| - Jelínková, Helena
- Němec, Michal
- Šulc, Jan
- Doroshenko, M.
- Osiko, V. V.
- Švejkar, Richard
- Konyushkin, V. A.
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| http://localhost/t...ganizacniJednotka
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