AbstractFerroelectric fluoride BaMgF4, β-Ga2O3 and F-doped core-free Y3Al5O12 single crystals for ultraviolet and vacuum ultraviolet (UV/VUV) applications, are introduced. 2-in. size BaMgF4 single crystals have been grown. Subsequently, second harmonic generation (SHG) in different wavelengths was demonstrated by the quasi-phase matching (QPM) devices. 2-in. size β-Ga2O3 single crystals, which have large bandgap, 4.8 eV, have been grown. Blue light emitting diodes (LEDs) on β-Ga2O3 were demonstrated. F-doped core-free Y3Al5O12 single crystals have been grown as a potential new lens material for UV/VUV.Graphical abstract2-in. size BaMgF4, β-Ga2O3 and F-doped core-free Y3Al5O12 single crystals were grown. They are candidates for UV/VUV optical applications, such as QPM-SHG, high power white LEDs, and lens material.Highlights► 2-in. size BaMgF4, β-Ga2O3 and F-doped core-free Y3Al5O12 single crystals were grown. ► BaMgF4-QPM devices were fabricated by the periodical ferroelectric domain inversion, and SHG 277 nm was obtained. ► InGaN-MQW was fabricated on β-Ga2O3 substrate, and SMD-type blue LED was demonstrated. ► F-doping and core-free quality enabled the higher transmittance in VUV and uniformity of refractive index, respectively.

{Tb3}[Sc2−xLux](Al3)O12 crystals have been grown and investigated for the first time for magneto-optical applications. Tb3Al5O12 exhibits the best magneto-optical features; however, its incongruent melting nature has led to the industrial use of Tb3Ga5O12. Tb3Sc2Al3O12 had been proposed as an alternative to Tb3Al5O12, but unfortunately its growth also presents several drawbacks. The present investigation shows that by the isovalent substitution of Sc3+ by Lu3+ in the octahedral site of the garnet structure, it is possible to improve the growth characteristics while preserving the superior magneto-optical properties. We demonstrate that {Tb3}[Sc2−xLux](Al3)O12 crystals show a higher visible transparency and a larger Faraday rotation than Tb3Ga5O12 crystals. {Tb3}[Sc2−xLux](Al3)O12 is therefore a very promising material in particular for new magneto-optical applications in the visible-near IR wavelength region.