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Люминесцентные и нелинейно-оптические свойства боратов LnGa3(BO3)4 (Ln=Nd, Sm, Tb, Er, Dy, Ho)

Оптика и спектроскопия. 2019. Т. 127. № 1. С. 112-117.
Болдырев К. Н., Кузьмин Н. Н., Леонюк Н. И., Стефанович С., Попова М.

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 (2000–21300 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.