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Optical constants of SCHOTT - IRG
IRG 27

Wavelength: µm
 (0.6 – 12.7)  
 

Derived optical constants

n   k   logX   logY   eV

Dispersion formula [ i ]

$$n^2-1=1.4005+\frac{3.4429λ^2}{λ^2-0.0871}+\frac{1.0394λ^2}{λ^2-805.5}$$

Conditions & Spec sheet

n_absolute: false
wavelength_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
  - type: "Schott formula"
    coefficients: -3.89e-06 0 0 1.77e-05 0 6.04e-02
density: 3.20 g/cm3
thermal_expansion:
  - temperature_range: 20 100 °C
    coefficient: 22.5e-06 K-1
specific_heat: 0.482 J/(g·K)
thermal_conductivity:
  - temperature: 25 °C
    value: 0.33 W/(m·K)
transition_temperature: 197 °C
Knoop_hardness: 1.11 GPa
fracture_toughness: 0.285 MPa·m1/2
Youngs_modulus: 16.77 GPa

References

SCHOTT Infrared Chalcogenide Glasses - IRG 27 Product flyer (Version April 2017)

Data

[Expressions for n]   [CSV - comma separated]   [TXT - tab separated]   [Full database record]

INFO

Infrared glass

Often, calcogenide glasses are used in the optical systems operating at infrared wavelengths ~1-14 µm (for instance, optical systems for thermal imaging and night vision)

Infrared glass types/brands from different makers

  • AMTIR (an acronym for "Amorphous Material Transmitting Infrared Radiation"): Amorphous Materials Inc. (AMI)
  • IG: VITRON
  • IRG: SCHOTT
  • BD: LightPath
  • OPTIR: Rochester Precision Optics (RPO)

Cross-reference

Composition AMI VITRON SCHOTT LightPath RPO
Ge33As12Se55 AMTIR-1 IG 2 IRG 22 OPTIR-1*
Ge30Sb13Se32Te25 IG 3 IRG 23*
Ge10As40Se50 IG 4 IRG 24
Ge28Sb12Se60 AMTIR-3* IG 5 IRG 25 BD-2 OPTIR-3*
As40Se60 AMTIR-2 IG 6 IRG 26 BD6
As40S60 AMTIR-6 IRG 27
(*) Out of production

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