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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(f250mm)
1.1*10-4(f100mm)
1.1*10-4(f100mm)
1.1*10-4(f100mm)
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(Ocm)
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