Silicon Plano Convex Lens / SLSI
The single crystal of silicon used in semiconductor has low absorption in the infrared wavelength of 1.2 - 6µm and it can be used as an optical element for infrared light.
It is a spherical plano convex lens that was made with the silicon single crystal.
It is used as a lens for receiving infrared light and in infrared sensors.
Even though it looks like the light does not transmit because of its metallic luster, it is transmitting through a wide infrared range of 1.2 - 6µm.The wavelength of 1.2 - 6 μm or less does not transmit, so it also provides the effect of infrared transmisshon filter.
Since the silicon lens has a refractive index of 3 or more, the lens curvature is slower then when made from standard glass.
Common Specifications
| Material | Silicon (SI) |  |
|---|---|---|
| Design Wavelength | 5μm | |
| Coating | Uncoated | |
| Surface Reflectance | 30％（per side） | |
| Shape | Spherical Plano Convex Polished Both Surfaces |
|
| Centration | ＜3′ | |
| Clear Aperture | 90% of diameter | |
| Surface Quality (Scratch-Dig) | 60－40 |
| Schematic | Outline Drawing |
|---|---|
 |
 |
| Part Number |
Focal Length f |
Back Focal Length fb |
Edge Thickness te |
Center Thickness tc |
|---|---|---|---|---|
| SLSI-25-25P | 25mm | 23mm | 2.0mm | 3.3mm |
| SLSI-25-50P | 50mm | 48mm | 2.0mm | 2.6mm |
| SLSI-25-100P | 100mm | 98mm | 2.0mm | 2.3mm |
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