Germanium (Ge) Description
|
Germanium is a commonly used infrared window material.
It's popular for its high index of refraction and good IR transmission. Germanium blocks UV, visible, and infrared up to about 2μm. Its good transmission range makes it useful for a number of applications, but due to its high index of refraction, an AR coating is required for sufficient transmission. Germanium is typical used in thermal imaging applications. It has provided to be most useful as windows and lens material in the 1.6~18μm region for semiconductor substrate application.
Internal transmitance |
Ge Refractive Index
| Wavelength, Microns |
Refractive Index |
| 2,0
|
4,1079
|
| 3,0
|
4,0446
|
| 4,0
|
4,0242
|
| 5,0
|
4,0153
|
| 6,0
|
4,0106
|
| 7,0
|
4,0076
|
| 8,0
|
4,0053
|
| 9,0
|
4,0047
|
| 10,0
|
4,0040
|
| 11,0
|
4,0031
|
| 12,0
|
4,0029
|
| 12,5
|
4,0024
|
| 15,0 |
4,0017 |
| |
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