Luminescence and Nonlinear Optical Properties of Borates LnGa3(BO3)4 (Ln = Nd, Sm, Tb, Er, Dy, or Ho)
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Luminescence spectra of single crystals of rare-earth gallium borates LnGa3(BO3)4 (Ln = Nd, Sm, Tb, Er, Dy, or Ho) at room (300 K) and cryogenic (10 K) temperatures are presented for the first time. Photoluminescence has been recorded in the wavelength range of 470–5000 nm (2000–21 300 cm–1) with a high spectral resolution (down to 0.1 cm–1) upon excitation by different diode lasers. The spectra obtained cannot be unambiguously interpreted within one luminescent center, which can be due to the presence of defects and/or inclusions of other crystalline phases. The optical nonlinearity of rare-earth–gallium borates has been estimated using the Kurtz–Perry powder technique. The typical intensities of the second-harmonic generation in gallium borate powders are 30–40 (with respect to quartz), and the optical nonlinearity is as good as the nonlinearity of the efficient rare-earth aluminum borate YAl3(BO3)4.
Keywords:rare-earth gallium borate crystals luminescence spectra second-harmonic generation
Spectroscopic analysis was performed on the Unique Scientific System Multifunctional High-Resolution Wide-Range Spectroscopy at the Institute for Spectroscopy, Russian Academy of Sciences .
This study was supported by the Russian Foundation for Basic Research, project no. 18-32-20142.
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