Hoya Corporation

Chiemi Hata

Tetsuro Izumitani

Shinichiro Hirota

Kouichi Hara

Hiroyuki Sawada

Michimasa Matsukawa

The process for producing a glass mold according to the present invention comprises forming, on a glass mold base, a thin film consisting of diamond crystallites, graphite crystallites and amorphous carbon and having a maximum surface roughness of 200 .ANG. or below, by a plasma CVD method or a thermal CVD method using a mixed gas comprising an organic gas and hydrogen gas, the concentration of the organic gas in the mixed gas being at least 3 mole %. The glass mold obtained according to the present process has advantages of having excellent releasability of molded glass article after press molding, excellent durability and a long life.

Process for producing glass mold

A silicophosphate laser glass having a composition comprising, in % by mole,

Silicophosphate laser glass

A process of surface-treating a laser glass is disclosed which comprises coating a specific sol solution obtained by hydrolysis and partial polycondensation of a mixture containing a metal alcoholate on the glass surface and heating the coated glass to form a glassy coating, wherein the glass surface may be treated, prior to the coating, with an alkali aqueous solution and with an aqueous solution of phosphoric acid in sequence, or the coating and the heating may repeated to form a double- or multilayer of the same or different kind of glassy coatings. The thus treated laser glass has increased thermal shock resistance and water resistance.

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Tokyo, Japan

Chiemi Hata