Optical window material, manufacturing method of optical window material, optical member, and manufacturing method of optical member

摘要

Problem to be solved: to prevent cracking of the glass substrate formed when bonding optical window material.Solution: the optical window member 10 is provided with a glass substrate 11 and a flat film frame shaped metal film 13 provided on the first main surface of the glass substrate 11. The inner periphery 13D of the metal film 13 has a plurality of projections 14 which protrude relatively radially inward and a plurality of recesses 15 which are relatively concave in the radial direction.Diagram