| Place of Origin: | Wuhan,China |
|---|---|
| Brand Name: | Wuhan Siwer Optics |
| Minimum Order Quantity: | 5 pieces |
| Price: | 20-98USD/piece |
| Packaging Details: | 1.Tissue paper. 2.Plastic foam packaging film. 3.Hard carton box with quakeproof filler |
| Delivery Time: | 3-5 weeks |
| Payment Terms: | T/T, Western Union |
| Supply Ability: | 3000 pieces/month |
| Material: | Silicon | Size Tolerance: | +/-0.1mm |
|---|---|---|---|
| Chamfer: | 0.2-0.5mm | Surface Quality: | 40/20 |
| Surface Flatness: | Lambda/4 In 25.4mm | Parallelism: | 0.01mm |
| Standard Coating: | AR/AR@3-5um | Size Range: | 3-300mm |
| Usage: | Infared System | ||
| High Light: | optical window,infrared system protectd window |
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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.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.
The MWIR optical components manufactured from silicon, or other suitable material, can be used to build a unit that can detect the muzzle flash from, for example, a sniper rifle. The detection of snipers is of great importance in, for example, Afghanistan, as many military lives are being lost to snipers. The gun flash from a sniper rifle has a distinct spectral distribution from the hot gases that are emitted. These gasses are, for example, CO and H2 together with CO2, N2 and H2O that produce distinct emissions in the 3 to 5µm band.
Silicon has a high thermal capacity that makes it ideal for laser mirrors.
The MWIR optical components manufactured from silicon, for example, need to be tested to ensure that they meet the design specification. MWIR interferometers are used to determine the surface quality in terms of the number of fringes the surface is from the required. Interferometers can measure the difference relative to flat or spherical surfaces. Additional converging or diverging optics are required to ensure that the interrogation beam is retro-reflected back along the incident path for convex and concave surfaces. As the MWIR interferometer is used to determine the accuracy of surfaces, then its components must be manufactured to a higher specification than that needed for the surface. These reference surfaces must be traceable to a national standard, such as NPL in the UK. Some typical applications where Silicon is used are MWIR Gun Flash Detection, Imaging systems, and MWIR Interferometers.
Silicon window is the best protective window in the imaging system with working wavelength of 3-5um. Compared with other infrared materials, it has the highest cost performance, and its low density can effectively reduce the weight of equipment.
| Material | Single Crystal Germanium |
| AR Coating Range | 3-5um |
| Reflectance over AR Coating Range @ 0° AOI |
Ravg < 1.5%,3-5um |
| Transmission over AR Coating Range @ 0° AOI |
Tavg > 97%,3-5um |
| Diameter Tolerance | +0.0/-0.1 mm |
| Thickness Tolerance | ±0.1 mm |
| Parallelism | 3 arc min |
| Surface Quality | 60-40 Scratch-Dig |
| Surface Flatness (Plano Side) |
λ/2 at 633nm |
| Surface Irregularity (Peak to Valley) |
λ/2 at 633nm |
| Clear Aperture | >Ø10.16 mm (Ø1/2" Lenses) >Ø20.32 mm (Ø1" Lenses) |
| Design Wavelength | 10.6 μm |
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Chemical Formula
|
Si
|
|
Molecular Weight
|
28.09
|
|
Crystal Class
|
Cubic
|
|
Lattice Constant, Å
|
5.43
|
|
Density, g/cm3 at 293 K
|
2.329
|
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Dielectric Constant for 9.37 x 109 Hz
|
13
|
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Melting Point, K
|
1690
|
|
Thermal Conductivity, W/(m K)
at 125K at 313K at 400K |
598.6 163 105.1 |
|
Thermal Expansion, 1/K
at 75K at 293K at 1400K |
-0.5 x 10-6 2.6 x 10-6 4.6 x 10-6 |
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Specific Heat, cal/(g K)
at 298K at 1800K |
0.18 0.253 |
|
Debye Temperature, K
|
640
|
|
Bandgap, eV
|
1.1
|
|
Solubility in water
|
None
|
|
Knoop Hardness, kg/mm2
|
1100
|
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Mohs Hardness
|
7
|
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Young's Modulus, GPa
|
130.91
|
|
Shear Modulus, GPa
|
79.92
|
|
Bulk Modulus, GPa
|
101.97
|
|
Poisson's Ratio
|
0.28
|
Procedure
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.
