The technological development for UV/VUV wavelength region is one of the most important issues at nowadays. In this presentation, some of the recent research subjects of our group, which aim to find new optical sources in UV/VUV, will be introduced.Ferroelectric fluoride single crystals for SHG at UV/VUV by the QPM technique is proposed. 2-inch BaMgF4 single crystals were grown, and QPM devices were fabricated. With these, SHG laser emission in the visible and UV were demonstrated.2-inch �-Ga2O3 single crystals, which has the largest band gap (Eg = 4.8 eV) among TCOs, were grown. MOCVD epitaxial growth of InGaN-MQW on �-Ga2O3 was realized. Vertical structured blue LEDs on �-Ga2O3 were demonstrated.2 inch F-doped core-free YAG single crystals have been proposed. The UV transmittance is increased by F-doping, and the refractive index was as large as 2.145 at 193 nm, indicating its potential use as new UV optical-grade lens.

Optical single crystals for UV/VUV applications

242nd National Meeting (2011)

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