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.

2-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.Figure optionsDownload as PowerPoint slideHighlights
► 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.