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Silicon Material Plano Convex Lens Lower Density With 3-5um AR Coating Range

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Silicon Material Plano Convex Lens Lower Density With 3-5um AR Coating Range

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Brand Name : Wuhan Siwer Optics

Place of Origin : Wuhan,China

MOQ : 2 pieces

Price : 25-200USD/piece

Payment Terms : T/T, Western Union

Supply Ability : 500 pieces/month

Delivery Time : 4-7 weeks

Packaging Details : 1.Tissue paper. 2.Plastic foam packaging film. 3.Hard carton box with quakeproof filler

Material : Silicon

Size tolerance : +/-0.1mm

Chamfer : 0.2-0.5mm

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

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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.

Silicon Material Plano Convex Lens Lower Density With 3-5um AR Coating Range Silicon Material Plano Convex Lens Lower Density With 3-5um AR Coating Range

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 Material Plano Convex Lens Lower Density With 3-5um AR Coating Range

Silicon Material Plano Convex Lens Lower Density With 3-5um AR Coating Range

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

Silicon Material Plano Convex Lens Lower Density With 3-5um AR Coating Range


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