| http://www.w3.org/ns/prov#value | - FIG. 9A is an enlarged view of an optical system for selecting the wavelength of an excitation light of the wavelength converter by a reflective diffraction grating and FIG. 9B is an enlarged view showing an optical system for selecting the wavelength of the excitation light by a transmissive diffraction grating in the first embodiment of the invention,
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