COPPER-CONTAINING SILICA GLASS, PROCESS FOR PRODUCING THE SAME, AND XENON FLASH LAMP USING THE COPPER-CONTAINING SILICA GLASS

摘要

This invention provides a copper-containing silica glass which emits fluorescence having a peak at a wavelength of 520 to 580 nm upon exposure to ultraviolet light with a wavelength of not more than 400 nm and has excellent long-term stability even in use at high output, and a process for producing the copper-containing silica glass and a xenon flash lamp using the copper-containing silica glass. A constitution is adopted in which not less than 5 wtppm and not more than 200 wtppm of copper is contained, fluorescence having a peak in a region of not less than 520 nm and not more than 580 nm is emitted by the application of ultraviolet light with a wavelength of not less than 160 nm and not more than 400 nm, and the internal transmittance at a wavelength of 530 nm per 2.5 mm-thickness is not less than 95%.