Germanium (Ge)

Infrared Optical Material - Ge

 

Basic Properties Gemanium (Ge) Chalcogenide glass containing germanium(GG-1) Chalcogenide glass containing germanium(GG-2) Chalcogenide glass containing germanium(GG-3)
Transmission band(μm) 1.8-23 1-16 0.9-16 0.9-16
Uniformity index 4.89×10-5(φ250mm) 1.1×10-4(φ100mm) 1.1×10-4(φ100mm) 1.1×10-4(φ100mm)
Refractive index(10µm) 4.0032 2.6002 2.4976 2.4347
Temperature coefficient of the refractive index(10-6/℃) 408 80 72  
Absorption(10µm.cm-1) 0.03 < 0.02 < 0.07 < 0.07
Hardness(kg/cm2) 800 150 170 236 virkers
Density(g/cm3) 5.323 4.67 4.40 4.36
Rupture Modulus (Mpa) 75 18.2 18.2  
Yang's modulus(Gpa) 103 21.8 22.1 18.6
Poisson's ratio 0.28 0.26 0.26 0.26
Melting point(℃) 937      
Thermal conductivity(Wcm-1k-1) 0.7 0.72 0.6  
Thermal expansion coefficient(X10-6℃C-1) 6.1 16 13 13.7
Specific Heat (Cal/g.k.) 0.074 0.066 0.07  
Permittivity 16      
Conductive models N      
Resistivity(Ωcm) 5-40      
Maximum diameter(mm) 300 150 150 150

 

Wavelength (µm) Index Wavelength (µm) Index Wavelength (µm) Index Wavelength (µm) Index
2.2 4.0879 5.0 4.0160 7.8 4.0061 10.6 4.0028
2.4 4.0732 5.2 4.0149 8.0 4.0057 10.8 4.0026
2.6 4.0599 5.4 4.0139 8.2 4.0053 11.0 4.0025
2.8 4.0523 5.6 4.0128 8.4 4.0049 11.2 4.0024
3.0 4.0451 5.8 4.0118 8.6 4.0044 11.4 4.0023
3.2 4.0399 6.0 4.0107 8.8 4.0042 11.6 4.0023
3.4 4.0311 6.2 4.0097 9.0 4.0040 11.8 4.0022
3.6 4.0289 6.4 4.0092 9.2 4.0038 12.0 4.0021
3.8 4.0267 6.6 4.0087 9.4 4.0036 12.2 4.0020
4.0 4.0245 6.8 4.0083 9.6 4.0034 12.4 4.0020
4.2 4.0223 7.0 4.0079 9.8 4.0033 12.6 4.0019
4.4 4.0205 7.2 4.0074 10.0 4.0031 12.8 4.0019
4.6 4.0189 7.4 4.0070 10.2 4.0030 13.0 4.0018
4.8 4.0172 7.6 4.0066 10.4 4.0029    

Infrared Optical Material

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