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    IRG 24

    IRG 24 has excellent transmission in the SWIR, MWIR, & LWIR and has the lowest dn/dT of the IR series glasses.

    Physical properties such as low dn/dT and low dispersion enable optical engineers to design color corrected optical systems without thermal defocusing.

    Furthermore, IRG 24 can be processed by conventional grinding and polishing, single point diamond turning, or molding to support low to high volume component level fabrication.

    IRG 24
    IR characteristics
    Composition Ge10As40Se50
    Density 4.47 g/cm3
    Thermal Expansion (20°C-100°C) 20.0·10-6/K
    Transition Temperature 225°C
    Thermal Change dn/dT (at 1 µm) 45.9·10-6/K
    Thermal Change dn/dT (at 5 µm) 21.1·10-6/K
    Thermal Change dn/dT (at 10 µm) 20.3·10-6/K
    Refractive Index (n at 10 µm) 2.6090
    Surface quality 60/40 polished both sides
    Surface flatness ≤ 5 waves P-V per surface at 632.8nm
    Edge Worked Saftety bevel
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    SCHOTT Article
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      Download Data sheet IRG 24
      Article Details
       
      Technical Details
      Internal Transmittance (Chart)
      Internal Transmittance (Table)
      Wavelength
      [µm]      		 Transmission
      (10 mm)      		 Transmission
      (2 mm)      		 Extinction
      [cm-1]
      0.8 52.2 87.8 0.650
      1.0 91.4 98.2 0.090
      1.5 96.7 99.3 0.034
      2.0 97.5 99.5 0.026
      2.5 97.5 99.5 0.025
      3.0 98.3 99.7 0.017
      3.5 98.5 99.7 0.015
      4.0 98.7 99.7 0.013
      4.5 96.3 99.3 0.037
      5.0 97.0 99.4 0.031
      5.5 99.5 99.9 0.005
      6.0 99.7 99.9 0.003
      6.5 99.7 99.9 0.003
      7.0 99.7 99.9 0.003
      7.5 99.2 99.8 0.008
      8.0 95.2 99.0 0.049
      Wavelength
      [µm]      		 Transmission
      (10 mm)      		 Transmission
      (2 mm)      		 Extinction
      [cm-1]
      8.5 98.5 99.7 0.015
      9.0 98.8 99.8 0.012
      9.5 98.7 99.7 0.013
      10.0 98.8 99.8 0.012
      10.5 97.8 99.6 0.022
      11.0 93.7 98.7 0.065
      11.5 78.0 95.2 0.248
      12.0 40.2 83.4 0.910
      12.5 15.8 69.2 1.844
      13.0 16.9 70.1 1.779
      13.5 43.0 84.4 0.845
      14.0 65.2 91.8 0.428
      14.5 70.3 93.2 0.353
      15.0 64.3 91.5 0.442
      15.5 49.9 87.0 0.696
      Material Data
      Constants of Dispersion Formulas
      B1 2.8965
      B2 2.9567
      B3 0.9461
      C1 0.0000
      C2 0.1620
      C3 1,939.1000
      D0 1.80·10-5
      E0 2.10·10-5
      λTK 1.67·10-3
      Calculation Formula: Refractive index as a function of wavelength and temperature
      Wavelength
      [µm]      		 Refractive Index
      (@ 22 °C)      		 Δn abs/ΔT [10–6/K]
      22 °C
      0.8 2.8028 0.0
      0.9 2.7555 0.0
      1.0 2.7555 46.0
      1.5 2.7249 31.3
      2.0 2.6612 26.3
      3.0 2.6274 22.9
      4.0 2.6222 21.7
      5.0 2.6192 21.1
      6.0 2.6170 20.8
      7.0 2.6151 20.6
      8.0 2.6132 20.5
      9.0 2.6111 20.4
      10.0 2.6090 20.3
      11.0 2.6066 20.2
      12.0 2.6040 20.2
      Wavelength
      [µm]      		 Thermal Change
      [dn/dt]
      1 µm 45.9·10-6/K
      5 µm 21.1·10-6/K
      10 µm 20.3·10-6/K
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