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- W2276712699 abstract "Generation of near-infrared light within the first biological optical window via frequency upconversion in Tm 3+ -doped PbGeO 3 -PbF 2 -CdF 2 glass excited within the second biological window at 1.319 μm is reported. The upconversion emission at 800 nm is the sole light signal observed in the entire UV-VIS-NIR spectral region making possible obtaining high contrast imaging. The dependence of the 800 nm signal upon the sample temperature was investigated and results showed an increase by a factor of x2.5 in the 30°C - 280°C range. Generation of detectable 690 nm for temperatures above 100°C in addition to the intense 800 nm main signal was also observed. The proposed excitation mechanism for the 800 nm thulium emitting level is assigned to a multiphonon-assisted excitation from the ground-state 3 H 6 to the 3 H 5 excited-state level, a rapid relaxation to the 3 F 4 level and followed by an excited-state absorption of the pump photons mediated by multiphonons connecting the 3 F 4 level to the 3 H 4 emitting level." @default.
- W2276712699 created "2016-06-24" @default.
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- W2276712699 date "2016-02-24" @default.
- W2276712699 modified "2023-09-23" @default.
- W2276712699 title "Efficient 800nm upconversion luminescence emission in 1.319μm excited thulium-doped fluorogermanate" @default.
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- W2276712699 doi "https://doi.org/10.1117/12.2208594" @default.
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