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Infrared Glasses (IG) offer excellent transmission in very wide spectral range covering NIR, MWIR and LWIR. Physical properties such as low dn/dT and low dispersion enable optical designers to engineer color-correcting optical systems without thermal defocusing. Our IR glass is an ideal material for both high performance infrared imaging systems as well as high volume commercial applications. It offers lower and more stable pricing than Germanium. It can be finished with traditional manufacturing technologies, or be molded directly into a finished optic offering a very cost-competitive solution. We have two standard Infrared Glasses- IG111 and IG131.
Bluebean Optical's IR Glass Product Features:
- Low dn/dT and low dispersion
- Excellent transmission in SWIR, MWIR & LWIR
- Customized coatings
- Effective production from prototypes to mass volumes
Infrared Chalcogenide Glass Properties:
|
IG111 |
IG131 |
|
|
Composition(mol%) |
Ge20Sb15Se65 |
Ge28Sb12Se60 |
|
Transmittance |
1.0-13.0um |
1.0-13.0um |
|
Temperature coeff of refractive index, dn/dt@298K |
5.8 x10-5/K@10.6um |
8.7 x10-5/K @10.6um |
|
Thermal expansion coefficient(293-473K) |
15.5 x 10-6/K |
15.0 x 10-6/K |
|
Thermal conductivity |
0.23 W/m.k |
0.50 W/m.k |
|
Transition temperature |
558K |
573K |
|
Thermal birefringent index coefficient(298K) |
5.8 x 10-5/K |
8.7 x 10-5/K |
|
Specific heat |
0.34 J/g.K |
0.56 J/g.K |
|
Density |
4.72 g/cm3 |
4.67 g/cm3 |
|
Young's modulus |
19.11 Gpa |
29.60 Gpa |
|
Torsion modulus |
7.52 Gpa |
18.00 Gpa |
|
Poisson’s ratio |
0.27 |
0.26 |
Transmission of Infrared Glass IG111 with a thickness of 3 mm:
Optical Refractive Index n & Transmission (293K):
|
λ (um) |
Refractive Index |
Transmission |
||
|
IG111 |
IG131 |
IG111 |
IG131 |
|
|
2.0 |
2.6261 |
- |
65.4% |
- |
|
3.0 |
2.6116 |
2.6273 |
65.6% |
66.9% |
|
4.0 |
2.6058 |
2.6224 |
66.2% |
66.7% |
|
5.0 |
2.6022 |
2.6183 |
66.9% |
66.4% |
|
6.0 |
2.5991 |
2.6157 |
67.4% |
66.5% |
|
7.0 |
2.5962 |
2.6130 |
67.8% |
66.1% |
|
8.0 |
2.5929 |
2.6099 |
67.7% |
66.8% |
|
9.0 |
2.5895 |
2.6064 |
66.2% |
66.7% |
|
10 |
2.5858 |
2.6026 |
67.6% |
66.9% |
|
11 |
2.5816 |
2.5985 |
67.4% |
66.5% |
|
12 |
2.5769 |
2.5948 |
67.8% |
51.3% |
Typical Fabrication Specifications:
|
Material |
Chalcogenide Glass |
|
Clear Aperture |
90% |
|
Diameter |
3.0-50mm, ±0.015mm |
|
Center Thickness |
±0.02mm |
|
Decentration |
±0.005mm |
|
Aspheric form(PV) |
0.5um |
|
Surface Quality |
80/60 |
|
Wedge |
5 arc minutes |
* Higher tolerances and AR coatings are available upon request.