| abstract |
The present invention provides a method for producing a porous glass layer easily, wherein a ripple is suppressed. n A method for manufacturing an optical member provided with a porous glass layer on a base member includes the steps of forming an intermediate layer containing at least one of silicon, potassium, and aluminum on the base member, forming a phase-separable glass layer on the intermediate layer, forming a phase-separated glass layer on the base member by heating the intermediate layer and the phase-separable glass layer at a temperature higher than or equal to the glass transition temperature of the phase-separable glass layer, and forming a porous glass layer on the base member by subjecting the phase-separated glass layer to an etching treatment. |