Optical constants of SCHOTT - IRG
IRG 25
Wavelength:
µm
(0.85–15.5)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2-1=2.7574+\frac{3.0990λ^2}{λ^2-0.1596}+\frac{1.6660λ^2}{λ^2-2045.5}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: 1.80e-05 0 0 2.10e-07 0 1.67e-03
density: 4.66 g/cm3
thermal_expansion:
- temperature_range: 20 100 °C
coefficient: 14.0e-06 K-1
specific_heat: 0.33 J/(g·K)
thermal_conductivity:
- value: 0.25 W/(m·K)
transition_temperature: 285 °C
Knoop_hardness: 1.13 GPa
fracture_toughness: 0.438 MPa·m1/2
Youngs_modulus: 22.1 GPa
References
SCHOTT Infrared Chalcogenide Glasses - IRG 25 Product flyer (Version April 2017)
Data
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 |
External Links
- Infrared - Wikipedia
- Chalcogenide glass - Wikipedia
- AMTIR amorphous material transmitting IR radiation - Amorphous Materials
- Brief introduction: chalcogenide glasses - VITRON
- Infrared Chalcogenide Glasses - SCHOTT
- Optical resources and technical information - LightPath