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Visible light emission images generated on a sapphire wafer by C-beam pumping. (a) Input power of 1.0 W with Va = 5 kV and Ia = 0.2 mA. (b) Input power of 13 W with Va = 10 kV and Ia = 1.3 mA. (c) UV emission characteristics depend on the C-beam pumping conditions and can be easily confirmed by the color change of the optical image.
