Glass, optical filter, and optical device

Abstract

A glass contains ytterbium and has a transmittance of 30% or less for light having a wavelength of 940 nm in terms of a thickness of 0.4 mm. The glass may have a transmittance of 78% or more for light having a wavelength of 850 nm in terms of a thickness of 0.4 mm.

Dependencies are inferred from the claim text.