Method for producing a silica glass

Details Method for producing a silica glass Method for producing a silica glass

1997-09-11

1999-06-01

Griffin, Steven P.

Glass manufacturing

Processes

With shaping of particulate material and subsequent fusing...

65 63, 65111, 65117, C03B 2000, C03C 304, C03C 306

Patent

active

059084820

ABSTRACT:
A silica glass has a structure determination temperature of 1200K or lower and a hydrogen molecule concentration of 1.times.10.sup.17 molecules/cm.sup.3 or more. The silica glass is used together with light in a wavelength region of 400 nm or shorter. The silica glass is produced by heating a silica glass ingot having a hydrogen molecule concentration of 1.times.10.sup.17 molecules/cm.sup.3 or more to a temperature of 1200-1350K, retaining the ingot at that temperature for a given period of time, and then, cooling the ingot to a temperature of 1000K or lower at a temperature-lowering rate of 50K/hr or less to anneal the ingot.

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