ULTRAVIOLET LIGHT SOURCE DEVICE

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PROBLEM TO BE SOLVED : To provide an ultraviolet light source device which is compact with high efficiency and a simple configuration. SOLUTION : The ultraviolet light source device is the light source including : an excitation light source; an optical waveguide (rare-earth-doped optical waveguide) with rare earths added thereto; a means for optically coupling the excitation light from the excitation light source with the optical waveguide; and a radiation part for radiating light to be generated from the rare-earth-doped optical waveguide. The light emission wavelength of the excitation light source is one of the wavelengths to be selected from the wavelength range of 340-500 nm. The core of the rare-earth-doped optical waveguide includes at least one kind of rare-earth element to be selected among Nd, Gd, Tb, Dy, Ho, Er, Tm. The wavelength of the light to be radiated from the rare-earth-doped optical waveguide is 405 nm or less, and also shorter than the excitation light wavelength. COPYRIGHT : (C)2010, JPO&INPIT