Silicon meniscus lens

Silicon(Si) Meniscus Lenses

 

Single crystaline silicon (Si) is a chemically inert gas material with high hardness and insoluble in water. It has excellent light transmission properties in the 1-7 μm band, and it also has excellent light transmission properties in the far infrared band 30-300 μm, it is the characteristic can't found in other optical infrared materials. Silicon single crystal is usually used for 3-5μm mid-wave infrared optical components. Due to the good thermal conductivity and low density of this material, it is also a common material for making laser optics.

silicon (Si) Meniscus lens is a lens with convex on one side and concave on the other. It can be a converging lens or a diverging lens, determined by a combination of refractive index, curvature and radius, and it’s has a wide range of applications in optical systems, such as lidar, optical sensors, spectrometers and other equipment, as a light path transmission or reflection device.

Our Company can provide silicon(Si) Meniscus Lenses with diameters from 2-300mm and thicknesses from 0.12-60mm (accuracy up to 20-10, 1/10L@633nm),coating AR, BBAR, AF or upon request.

 

Technical parameters of Silicon(Si) Meniscus Lens

Diameter

2-300mm

Focal length

15-5000mm

Thicknesses

0.12-60mm

Dimension tolerance

+0/-0.1mm

Thickness tolerance

±0.1mm

Surface quality (scratch & dig)

60-40, 40-20, or better

Surface accuracy

λ/2, λ/4 or better

Parallelism

3' ,30''

Bevel

0.1~0.3mm x 45 degree

Clear aperture

>85%,>90%

Coating

AR coating or cutom


Material properties of Silicon(Si)

Optical Properties
Transmission Range1.2-15μm
Refractive Index3.41776%@10μm
Reflection Loss46.1%@10μm
StructureSingle crystal,synthetic
Cleavage Planes<111>
Physical Properties
Density[g/cm3]2.33
Melting Point []1414
ThermalConductivity [W/(m×K)]163 @ 313K
Thermal Expansion [10-6/K]2.6 @ 293K
Knoop Hardness [kg/mm2]1100
Specific Heat Capacity [J/(kg×K)]712.8
Dielectric Constant13 @f= 9.37GHz
Young's Modulus (E) [GPa]130.91
Shear Modulus(G) [GPa]79.92
Bulk modulus(K) [GPa]101.97
Poisson Coefficient0.266
Chemical   Properties
Solubility / g/LNone
Molecular Weight / g/mol28.09

 

Transmission curve

 

Silicon has high thermal conductivity and low density. Silicon is a widely used NIR material for applications in the 1.2 to 7 μm region due to its low cost and low density. Silicon is well suited for weight-sensitive applications, especially those in the 3 -5 μm range.

 

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