| CPC G02B 5/208 (2013.01) [C03C 3/17 (2013.01); H04N 23/55 (2023.01)] | 14 Claims |
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1. A glass for an optical filter, the glass being a phosphate glass comprising Cu, wherein
the glass has:
an average transmittance of 80% or more at a wavelength of 430 nm to 550 nm;
an average transmittance of 2% or less at a wavelength of 800 nm to 950 nm;
an average transmittance of 3% or less at a wavelength of 1000 nm to 1200 nm;
an average transmittance of 5% or less at a wavelength of 700 nm to 1200 nm;
a transmittance of 25% or more at a wavelength of 1550 nm; and
a wavelength at which a transmittance is 50% of 615 nm or more in a wavelength range of 600 nm to 800 nm.
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