Silica glass body manufacturing method and heating device

Abstract

A method for manufacturing a silica glass body includes preheating a porous silica glass body, and placing the preheated porous silica glass body in a resonator that resonates a microwave having a frequency band of 1 GHz to 30 GHz to heat the porous silica glass body with the microwave. At least a part of the porous silica glass body contains an additive other than silicon and oxygen. The porous silica glass body is preheated to a temperature equal to or higher than a glass transition temperature of the additive-added portion of the porous silica glass body in the preheating. The porous silica glass with the additive is heated with the microwave in the heating with the microwave.

Dependencies are inferred from the claim text.