Optical member, image pickup apparatus, and method for manufacturing optical member

A method for manufacturing an optical member provided with a base member and a glass layer holding a transparent material in the inside of a porous structure disposed on the base member, the method comprising the steps of:

• forming a glass powder layer containing a plurality of glass powders on the base member;
• forming a glass body layer by fusing the plurality of glass powders contained in the glass powder layer;
• forming a phase-separated glass layer by heating the glass body layer;
• forming a porous glass layer having three-dimensionally penetrated holes by etching the phase-separated glass layer;
• and
• forming a glass layer by allowing the holes in the porous glass layer to hold a transparent material,
• wherein the forming of a glass layer is a step to allow the holes in the porous glass layer to hold the transparent material in such a way that, in the thickness direction of the glass layer, the porosity in the base member side with respect to the center line of the glass layer in the thickness direction becomes smaller than the porosity in the side opposite to the base member with respect to the center line of the glass layer in the thickness direction.

An optical member comprising:

• a base member;
• and
• a glass layer holding a transparent material in the inside of a porous structure disposed on the base member,
• wherein, in the thickness direction of the glass layer, the content of the transparent material in the base member side with respect to the center line of the glass layer in the thickness direction is larger than the content of the transparent material in the side opposite to the base member with respect to the center line of the glass layer in the thickness direction.

An optical member comprising:

• a base member;
• and
• a glass layer holding a transparent material in the inside of a porous structure disposed on the base member,
• wherein, in the thickness direction of the glass layer, the content of carbon in the base member side with respect to the center line of the glass layer in the thickness direction is larger than the content of carbon in the side opposite to the base member with respect to the center line of the glass layer in the thickness direction.