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| Brand Name : | Wuhan Siwer Optics | 
| Price : | 6-15USD/piece | 
| Payment Terms : | T/T, Western Union | 
| Supply Ability : | 3000 pieces/month | 
| Delivery Time : | 3-5 weeks | 
A flame detector usually needs to detect 4.4um infrared light. Our silicon protection window can not only cut off the interference light of visible light and near-infrared light, but also has a very competitive price.
 

| 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 | 
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 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  | 
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  | 
Mohs Hardness  | 7  | 
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.
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