Optical filter

An optical filter comprising:

• a phosphate glass;
• a dielectric multilayer film 1 and a dielectric multilayer film 2 provided on both surface sides of the phosphate glass;
• a barrier film 1 provided between the phosphate glass and the dielectric multilayer film 1;
• a barrier film 2 provided between the phosphate glass and the dielectric multilayer film 2;
• and
• a light-absorbing layer provided on or above the dielectric multilayer film 2, wherein
• the phosphate glass has near-infrared ray absorbing properties, is substantially free from fluorine atoms, and has a thickness of 0.3 mm or less,
• the light-absorbing layer comprises a near-infrared ray absorbing dye,
• the barrier film 1 and the barrier film 2 each independently comprise one or more selected from TiO2, Nb2O5, Ta2O5, and HfO2, and
• the optical filter satisfies all of the following spectral characteristics (i-1) to (i-5):
• (i-1) an average transmittance at a wavelength of 440 nm to 500 nm is 75% or more at an incident angle of 0 degrees and 60% or more at an incident angle of 60 degrees,
• (i-2) an average transmittance at a wavelength of 750 nm to 1,000 nm is 2% or less at an incident angle of 0 degrees and 2% or less at an incident angle of 60 degrees,
• (i-3) in a spectral transmittance curve at an incident angle of 0 degrees, a wavelength IR10(0 deg) at which a transmittance is 10% is in a range of 600 nm to 700 nm,
• (i-4) an absolute value of a difference between the wavelength IR10(0 deg) at which the transmittance is 10% in the range of 600 nm to 700 nm in the spectral transmittance curve at an incident angle of 0 degrees and a wavelength IR10(60 deg) at which a transmittance is 10% in the range of 600 nm to 700 nm in a spectral transmittance curve at an incident angle of 60 degrees is 15 nm or less, and
• (i-5) a transmittance at a wavelength of 1,100 nm is 5% or less at an incident angle of 0 degrees and 5% or less at an incident angle of 60 degrees.