Agency of Industrial Science and Technology

Agency of Industrial Science and Technology Ministry of International

Kohei Fukumi

Makoto Kinoshita

Saburo Kose

Hiroshi Yamashita

Naoyuki Kitamura

Kenichi Kinugawa

Isao Kondoh

Jun Matsuoka

Akiyoshi Chayahara

Kanenaga Fujii

Junji Nishii

Hiroshi Yamanaka

A method for producing a SiO.sub.2 glass material having regions changed in light refractive index is provided which comprises implanting at least 5.times.10.sup.19 Ge ions/cm.sup.3 into a SiO.sub.2 glass substrate, heat-treating the substrate at a temperature exceeding 300.degree. C., and exposing the substrate to an ultraviolet light. Also provided is a SiO.sub.2 glass material produced by the method.

Method for production of SiO.sub.2 glass material having regions changed

A process for producing a glass having a rod refractive index distribution, which includes pressing a glass at a temperature below the glass transition temperature to form a glass having a density increased towards the surface layer thereof, or alternatively includes heating a glass at a temperature around the transition temperature at the lowest to prepare glass having a uniformly enhanced density and heating the treated glass under a pressure lower than the applied pressure at a temperature below the glass transition temperature of the glass to prepare a rod glass having a density increased towards the central portion.

Glass having refractive index distribution

A process for producing a rod glass having a refractive index distribution, which includes pressing a glass at a temperature below the glass transition temperature to form a glass having a density increased towards the surface layer thereof, or alternatively includes heating a glass at a temperature around the transition temperature at the lowest to prepare glass having a uniformly enhanced density and heating the treated glass under a pressure lower than the applied pressure at a temperature below the glass transition temperature of the glass to prepare a glass having a density increased towards the central portion.

Process for producing rod glass having refractive index distribution

Growing community of inventors

Ikeda, Japan

Kohei Fukumi