TECHNOLOGY FOCUS - CERAMICS AND GLASS - Preferred Composition: The quartz glass base material contains synthetic quartz glass or light-scattering quartz glass including micro bubbles and/or micro interface. Alternately, quartz glass component has quartz glass base material, wavelength conversion quartz glass layer formed on surface of the base material and containing fluorescent substance particles, transparent coating membrane formed on the surface of the wavelength conversion quartz glass layer, and middle quartz glass layer containing 10-60% fluorescent substance particles between the wavelength conversion quartz glass layer and the transparent coating membrane. The quartz glass contains gallium, cerium, copper and/or titanium. Preferred Process: The polysilazane-containing solution applied on quartz glass base material is dried and heated at 100-600 degrees C to obtain 0.1-10 mu m-thick quartz glass surface layer film. The above processes are repeated in several times to form laminated structure of 1-500- mu m-thick quartz glass surface layer film. The quartz glass component is alternately manufactured by forming thin film coat of solution containing silica and/or silica precursor on surface of wavelength conversion quartz glass layer or middle quartz glass layer, drying and heating obtained transparent coating membrane. The transparent coating membrane and wavelength conversion quartz glass layer are formed of sol gel process. Tetraethyl orthosilicate hydrolysis solution formed by mixing fluorescent substance particles, water and tetraethyl orthosilicate is coated to quartz glass base material, dried in air, heated at 300-1000 degrees C and 0.1-10 mu m-thick wavelength conversion quartz glass layer is formed in the surface of the quartz glass base material. The transparent coating membrane is formed on surface of the wavelength conversion quartz glass layer. The mass ratio of fluorescent substance particles with respect to the total amount of tetraethyl orthosilicate and fluorescent substance particles in tetraethyl orthosilicate hydrolysis solution is 10:1-9. The titanium-containing inorganic membrane is obtained by coating solution containing titanium on surface of the wavelength conversion quartz glass layer and sintering. The fluorescent substance concentration of the wavelength conversion quartz glass layer is distributed to low concentration from glass board material side from high concentration toward surface side of the wavelength conversion quartz glass layer. The several fluorescent substances of wavelength conversion quartz glass layer are laminated in several times to obtain laminated structure of wavelength conversion quartz glass layer having thickness of 1-500 mu m. The several fluorescent substances of wavelength conversion quartz glass layer are laminated in several times.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The transparent coating membrane is transparent inorganic membrane which is titanium-containing inorganic membrane including titanium oxide which undergoes anatase crystallization.