One of the promising ways to improve the efficiency of lasers operating at wavelengths near 1600 nm and 3000 nm on
base of garnets doped with Er3+ ions is their sensitization with Ce3+ ions. In this work the investigation results of spectral
characteristics of YAG:Er3+, YAG:Ce3+ and YAG:Ce3+, Er3+ crystals at room temperatures are presented. Dependencies
of these characteristics on the optical excitations at 457 nm, 808 nm and 980 nm wavelengths are studied. The influence
of Ce3+ sensitizer ions on the efficiency and mechanisms of the various energy levels' population processes of Er3+activator ions in the YAG matrix is discussed.
The up-converted luminescence at 525, 550 nm and 670 nm wavelengths, as well as the ordinary luminescence near
1600 nm wavelength of the LiNbO3:Yb3+, Er3+ crystal are investigated under optical excitations at 808 nm and 980 nm.
Dependencies of luminescence on intensities of optical pumping at both wavelengths are presented. The possible
mechanisms of up-converted emissions obtaining as well as population mechanisms of the Er3+ ion 4I13/2 energy level in
the LiNbO3 matrix are discussed.
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