Optical Filters and Specialty Glasses

IR Transmitting Glass
K-GIR79

  • High transmission from visible light to middle infrared
  • No birefringence exhibition since isotropic materials are used
  • Excellent weather resistance and workability

Reference data

Refractive index

nF (486.1 nm) 1.87762 nC (656.3 nm) 1.85161 Dispersion (vd) 33.0
nd (587.6 nm) 1.85920 n (3.5421 µm) 1.795
λ (nm) Refractive index λ (nm) Refractive index
365 1.93019 1813 1.82082
405 1.90617 2019 1.818
436 1.89290 2038 1.818
478 1.87919 2058 1.818
486 1.87762 2220 1.816
546 1.86536 2325 1.814
588 1.85920 2418 1.813
644 1.85279 2613 1.811
656 1.85161 2770 1.808
707 1.84745 2973 1.805
1014 1.83378 3177 1.802
1129 1.83102 3447 1.797
1309 1.82768 3542 1.795
1367 1.82675 3835 1.790
1529 1.82443 3952 1.788
1548 1.82418 4128 1.784
1692 1.82232 4409 1.778
1711 1.82208 4564 1.774

Wavelength dependency of the refractive index

Spectral Transmittance (t=10 mm)

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