4.6 Article

Excited-state absorption and fluorescence dynamics of Er3+:KY3F10

期刊

OPTICAL MATERIALS
卷 79, 期 -, 页码 279-288

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ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2018.03.058

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Er:KY(3)Fio; Excited-state absorption; Fluorescence; Energy transfers; Laser emission

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We report here on a complete investigation of the excited-state absorption and fluorescence dynamics of Er3+ doped KY3F10 single crystals versus dopant concentrations and optical excitation conditions. Radiative and effective (including non-radiative relaxations) emission lifetimes and branching ratios are determined from a Judd-Ofelt analysis of the absorption spectra and via specific fluorescence experiments using wavelength selective laser excitations. Excited-state absorption and emission spectra are registered within seven spectral domains, i.e. 560 mn, 650 nm, 710 nm, 810 nm, 970 run, 1550 nm and 2750 nm. A maximum gain cross-section of 0.93 x 10(-21) cm(2) is determined at the potential laser wavelength of 2.801 mu m for a population ratio of 0.48. Saturation of fluorescence intensities and variations of population ratios versus pumping rates are registered and confronted with a rate equation model to derive the rates of the most important up-conversion and cross-relaxation energy transfers occurring at high dopant concentrations.

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