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Silicon Material Infrared Window , Ir Cut Filter With Lower Refractive

    Buy cheap Silicon Material Infrared Window , Ir Cut Filter With Lower Refractive from wholesalers
     
    Buy cheap Silicon Material Infrared Window , Ir Cut Filter With Lower Refractive from wholesalers
    • Buy cheap Silicon Material Infrared Window , Ir Cut Filter With Lower Refractive from wholesalers

    Silicon Material Infrared Window , Ir Cut Filter With Lower Refractive

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    Brand Name : Wuhan Siwer Optics
    Price : 20-98USD/piece
    Payment Terms : T/T, Western Union
    Supply Ability : 3000 pieces/month
    Delivery Time : 3-5 weeks
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    Silicon Material Infrared Window , Ir Cut Filter With Lower Refractive

    Infrared imaging system Silicon protected windows

    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.




    Optical Properties of Silicon Window

    MaterialSingle Crystal Germanium
    AR Coating Range3-5um
    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
    Parallelism3 arc min
    Surface Quality60-40 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 Wavelength10.6 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 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


    Infrared Elements Selection Guide

    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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