Silicon plano concave lens


Silicon(Si) Plano-Concave 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)plano-concave lens is composed of a flat surface and a concave spherical surface, which can produce negative spherical aberration and is often used in systems where the light is expanded or the focal length is increased to balance the deviation of other lenses and 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) Plano-Concave 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) Plano-Concave Lenses

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.

  

Typical size of Silicon(Si) Plano-Concave Lenses

Part No

Diamm)

FL (mm)

CT (mm)

ET    (mm)

Wavelength(um)

Radius (mm)

Surface quality

NOVAFSIPC

2-300

15-5000

0.12-60

Customized

Customized

Customized

60-40