Germanium Single Lens / SLGE
The single crystal of germanium used in semiconductor is less absorption in the infrared wavelength of 2 - 20μm and it can be used as an optical element of the infrared light. It is a single lens which was made with the germanium crystal. It is used as a lens of a camera to observe the infrared, such as thermography.
Even though it looks like the light does not transmit because of its metallic luster, it is transmitting through a wide infrared range of 2 - 20μm.The wavelength of 1.5μm or less does not transmit, so it also provides the effect of an infrared transmission filter.
Since the silicon lens has a refractive index of 4 or more, the lens curvature is slower then when made from standard glass.。
Common Specifications
| Material | Germanium (Ge) |  |
|---|---|---|
| Design Wavelength | 10.6μm | |
| Coating | Uncoated | |
| Surface Reflectance | 36％（per side） | |
| Shape | Spherical Plano Convex Polished Both Surfaces |
|
| Centration | ＜3′ | |
| Surface Quality (Scratch-Dig) | 60 - 40 | |
| Clear Aperture | 90% of the diameter |
| Schematic | Outline Drawing |
|---|---|
 |
 |
| Part Number | Focal Length f |
Back Focal Length fb |
Edge Thickness te |
|---|---|---|---|
| SLGE-25-25P | 25mm | 24.25mm | 1.95mm |
| SLGE-25-50P | 50mm | 49.25mm | 2.48mm |
| SLGE-25-100P | 100mm | 99.25mm | 2.74mm |
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