AR3-5um Coated Infrared Optical Lens , Optical Silicon Si Lenses

Basic Information
Place of Origin: Wuhan,China
Brand Name: Wuhan Siwer Optics
Minimum Order Quantity: 4 pieces
Price: 25-200USD/piece
Packaging Details: 1.Tissue paper. 2.Plastic foam packaging film. 3.Hard carton box with quakeproof filler
Delivery Time: 4-7 weeks
Payment Terms: T/T, Western Union
Supply Ability: 500 pieces/month
Detail Information
Material: Silicon Size Tolerance: +/-0.1mm
Chamfer: 0.3mm Surface Quality: 40/20
Surface Accuracy: Lambda/2 In 25.4mm Centration: 3 Arc Min
Coating: AR/AR@3-5um Size Range: 5-300mm
Usage: Infared System Protected Lens
High Light:

optical filter lens


optical instruments lens

Product Description

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.


AR3-5um Coated Infrared Optical Lens , Optical Silicon Si Lenses 0    AR3-5um Coated Infrared Optical Lens , Optical Silicon Si Lenses 1

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:

AR3-5um Coated Infrared Optical Lens , Optical Silicon Si Lenses 2


AR3-5um Coated Infrared Optical Lens , Optical Silicon Si Lenses 3

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

AR3-5um Coated Infrared Optical Lens , Optical Silicon Si Lenses 4

Production process

AR3-5um Coated Infrared Optical Lens , Optical Silicon Si Lenses 5

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.


Contact Details