Shin-Etsu Quartz Products Co., Ltd.

Opto-Electronics Laboratory, Inc.

Michinari Ohuchi

Akira Fujinoki

Hiroyuki Nishimura

Tetsuji Ueda

Masahiro Nakatsuka

Hidetsugu Yoshida

It is an object of the present invention to provide a copper-containing silica glass which emits fluorescence having a peak in a wavelength range of from 520 nm to 580 nm under irradiation of ultraviolet light with a wavelength of 400 nm or less, and which is excellent in long term stability even in the high output use. The copper-containing silica glass is made to have copper of from 5 wtppm to 200 wtppm, which emits fluorescence having a peak in a wavelength range of from 520 nm to 580 nm under irradiation of ultraviolet light with a wavelength ranging from 160 nm to 400 nm, and in which an internal transmittance per 2.5 mm thickness at a wavelength of 530 nm is 95% or more.

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Koriyama, Japan

Michinari Ohuchi