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Sensitized holmium upconversion emission in triply doped with , , and
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View: Figures


Image of FIG. 1.
FIG. 1.

Unpolarized room-temperature absorption spectrum of triply doped crystal containing of . The inset presents the emission and absorption profile.

Image of FIG. 2.
FIG. 2.

Room-temperature UC emission spectra of triply doped crystal excited by 800 nm femtosecond laser with pump energy of under different laser operating repetition rate. The inset shows an expanded view around 480 nm.

Image of FIG. 3.
FIG. 3.

Dependence of and emission integrated intensities (under 1000 Hz excitation) on nominal concentration in triply doped crystals. The lines are just guides for the eyes.

Image of FIG. 4.
FIG. 4.

Emission dynamics of in triply doped crystals under the excitation into levels at 800 nm.

Image of FIG. 5.
FIG. 5.

Double logarithmic plot of the pump energy dependence of the UC emission intensities around 485, 545, and 665 nm after excitation at 800 nm for triply doped crystal. The numbers denote the slopes of lines.

Image of FIG. 6.
FIG. 6.

Semilogarithmic plot of the decay curve of at 545 nm in the sample containing of . The solid line is the best fit to Eq. (5).

Image of FIG. 7.
FIG. 7.

Schematic UC emission processes under 800 nm excitation proposed for triply doped crystals. The solid, dashed, and jagged arrows denote radiative transition, ET, and multiphonon relaxation, respectively.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Sensitized holmium upconversion emission in LiNbO3 triply doped with Ho3+, Yb3+, and Nd3+