Infrared Chalcogenide Glasses

Supply Forms | Thicknesses | Dimensions |
---|---|---|
Typical forms of supply will depend on customer‘s requirements | up to 150 mm | diameter: up to 95 mm |
Offering of polished blanks for sample parts | 5 mm up to 30 mm | diameter: 10 mm up to 95 mm |
Infrared Chalcogenide Glasses | |||||
---|---|---|---|---|---|
Material Properties | IRG 22 | IRG 24 | IRG 25 | IRG 26 | IRG 27 |
Composition | Ge33As12Se55 | Ge10As40Se50 | Ge28Sb12Se60 | As40Se60 | As2S3 |
Density | 4.41 g/cm3 | 4.47 g/cm3 | 4.66 g/cm3 | 4.63 g/cm3 | 3.20 g/cm3 |
Thermal expansion (20 – 100°C) | 12.5 · 10–6/K | 20.0 · 10–6/K | 14.0 · 10–6/K | 21.4 · 10–6/K | 22.5 · 10–6/K |
Transition temperature | 368 °C | 225 °C | 285 °C | 185 °C | 197 °C |
Thermal change dn/dT* | 94.8 · 10–6/K (1 μm) | 46.0 · 10–6/K (1 μm) | 79.2 · 10–6/K (1 μm) | 76.2 · 10–6/K (1 μm) | 15.6 · 10–6/K (1 μm) |
67.7 · 10–6/K (5 μm) | 21.15 · 10–6/K (5 μm) | 62.0 · 10–6/K (5 μm) | 33.4 · 10–6/K (5 μm) | -3.2 · 10–6/K (5 μm) | |
67.1 · 10–6/K (10 μm) | 20.3 · 10–6/K (10 μm) | 61.1 · 10–6/K (10 μm) | 32.2 · 10–6/K (10.6 μm) | -3.7 · 10–6/K (10.6 μm) | |
Refractive index | 2.5971 (1 μm) | 2.7249 (1 μm) | 2.7284 (1 μm) | 2.9316 (1 μm) | 2.4841 (1 μm) |
2.5104 (5 μm) | 2.6192 (5 μm) | 2.6183 (5 μm) | 2.7909 (5 μm) | 2.4129 (5 μm) | |
2.4968 (10 μm) | 2.6090 (10 μm) | 2.6030 (10 μm) | 2.7781 (10 μm) | 2.3842 (10 μm) |