Unpolarized room-temperature absorption spectrum of triply doped crystal containing of . The inset presents the emission and absorption profile.
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.
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.
Emission dynamics of in triply doped crystals under the excitation into levels at 800 nm.
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.
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).
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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