Infrared Silicon(Si) Lens
Silicon (Si) is one of the hardest minerals and optical materials available for use in the NIR (1µm) to about 6µm. Optical quality Silicon is usually doped (5 to 40 ohm cm) to prevent absorption bands within the transmission waveband. Silicon has a lower refractive index than germanium and has a lower density that makes for less weighty optical designs.
Silicon is ideal for use as windows in the 3 to 5µm (MWIR) waveband and as substrate for optical filters. This waveband (3 to 5µm) is important for the detection of sources radiating at a black body temperature of 700K, such as the muzzle flash from guns, such as sniper rifles and mortar pieces. Every component is individually tested by our highly skilled technicians in our state of the art metrology lab to ensure all components meet our high quality standards. Its transmission is about 50% within the 1 to 6µm and above 50µm, which will mean that anti-reflection coatings are required to improve the transmission.
Optical Specifications of Silicon Lens
| Material | Silicon |
| AR Coating Range | 3-5um |
| Diameter Tolerance | +0.0/-0.1 mm |
| Thickness Tolerance | ±0.1 mm |
| Focal Length Tolerance | ±2% |
| Surface Quality | 60-40 Scratch-Dig |
Surface Flatness
(Plano Side) | λ/2 at 633nm |
Spherical Surface Powerc
(Convex Side) | 1.5λ at 633nm |
Surface Irregularity
(Peak to Valley) | λ/2 at 633nm |
| Centration | <3 arcmin |
| Clear Aperture | >Ø10.16 mm (Ø1/2" Lenses)
>Ø20.32 mm (Ø1" Lenses) |
| Design Wavelength | 10.6 μm |
Transmittance of Antireflection coatings:
Silicon properties:
| Chemical Formula | Si |
| Molecular Weight | 28.09 |
| Crystal Class | Cubic |
| Lattice Constant, Å | 5.43 |
| Density, g/cm3 at 293 K | 2.329 |
| Dielectric Constant for 9.37 x 109 Hz | 13 |
| Melting Point, K | 1690 |
| Thermal Conductivity, W/(m K) | |
| at 125 K | 598.6 |
| at 313 K | 163 |
| at 400 K | 105.1 |
| Thermal Expansion, 1/K | |
| at 75 K | -0.5 x 10-6 |
| at 293 K | 2.6 x 10-6 |
| at 1400 K | 4.6 x 10-6 |
| Specific Heat, cal/(g K) | |
| at 298 K | 0.18 |
| at 1800 K | 0.253 |
| Debye Temperature, K | 640 |
| Bandgap, eV | 1.1 |
| Solubility in water | None |
| Knoop Hardness, kg/mm2 | 1100 |
| Mohs Hardness | 7 |
| Young's Modulus, GPa | 130.91 |
| Shear Modulus, GPa | 79.92 |
| Bulk Modulus, GPa | 101.97 |
| Poisson's Ratio | 0.28 |
Infrared Elements Selection Guide
What's the way of shipping?
We accept DHL, Fedex, TNT, UPS, SF, EMS etc. If you have your own express account, it's great.
How to pay?
(1) T/T, PayPal, West Union,etc
(2) Bank Fee: West Union-USD30.00(≤USD3000.00),
T/T-USD20.00+, PayPal-5%. Please consult the local bank.
What's the deliver time?
For inventory: the delivery time is around 5 workdays.
Customized products: the delivery time is 10 to 30 workdays. According to the quantity and precision.
Can I customize the products based on my need?
Yes, we can customize the material, specifications and optical coating for your optical components based on your needs. OEM is available.
Product Tags:
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Customizable Plano Convex Lens , Optical Grade Silicon Infrared Lens Images
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