Growth and characteristics of optical single crystals for UV/VUV applications

Ferroelectric 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.