Optical Filters and Specialty Glasses

IR Transmitting Glass
K-GIR140

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

Reference data

Refractive index

nF (486.1 nm) 1.76334 nC (656.3 nm) 1.74591 Dispersion (vd) 43.1
nd (587.6 nm) 1.75106 n (3.5421 m) 1.704
λ (nm) Refractive index λ (nm) Refractive index
365 1.79635 1813 1.72393
405 1.78165 2019 1.722
436 1.77325 2038 1.722
480 1.76437 2058 1.721
486 1.76334 2220 1.720
546 1.75521 2325 1.720
588 1.75106 2418 1.718
644 1.74672 2613 1.716
656 1.74591 2770 1.714
707 1.74306 2973 1.712
1014 1.73354 3177 1.709
1129 1.73156 3447 1.705
1309 1.72913 3542 1.704
1367 1.72844 3835 1.699
1529 1.72670 3952 1.697
1548 1.72651 4128 1.694
1692 1.72509 4409 1.689
1711 1.72491 4564 1.686

Wavelength dependency of the refractive index

Spectral Transmittance (t=10 mm)

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