Name: Silicon Lens
Rating: 4.5 (100 reviews)

Key Features

Materials

Optical glass such as K9, fused silica, sapphire, MgF2, silicon (Si), ZnSe, ZnS, etc. These materials possess high transmittance, low absorption, low scattering, uniform refractive index, and specific dispersion characteristics.
Shape

Precisely hemispherical. The machining precision of the center and radius of curvature of the sphere is extremely high.
Surface Quality

The surface is precision polished to an optical grade of 10-5 to ensure image quality and reduce scattering and aberrations.
Coating

An AR coating is typically applied to the concave surface to maximize the transmittance of specific wavelengths of light (e.g. visible light) and reduce reflection loss.

Specification of Silicon Lens

Crystallographic	Growth Method	CZ OR FZ
Crystallographic	Purity	>99.9999%
Optical	Refractive Index at n3.0	3.436
	Refractive Index at n5.0	3.426
	Thermal Coefficient of Refractive Index at 25 ℃	1.50 x 10-4
	Transmission Range, microns	1.2 - 10, 50 - 100
	Thermal Linear Expansion, ℃-1 for 25 ℃	2.55 x 10-6
Thermal	Thermal Conductivity, W/(m * ℃) at 27 ℃	159
	Specific Heat Capacity, J/(kg * ℃)	0.712 x 103
	Melting Point, ℃	1412
Mechanical	Density, g/cm3 at 20 ℃	2.33
	Mohs Hardness	7
	Young Modulus (E), Pa	1.89 x 1010
	Shear Modulus (G), Pa	7.99 x 1010
	Poisson Ratio	0.266
Chemical	Molecular Weight	28.09
Chemical	Molecular Weight	insoluble

Ref. Index vs. Wavelength λ

Typical Application Areas

Underwater Photography and Detection:

Observation windows for underwater cameras, ROVs (Remotely Operated Vehicles), and AUVs (Autonomous Underwater Vehicles). The hemispherical design provides a near 180° wide field of view while withstanding water pressure.
Underwater Photography and Detection:

Observation windows for underwater cameras, ROVs (Remotely Operated Vehicles), and AUVs (Autonomous Underwater Vehicles). The hemispherical design provides a near 180° wide field of view while withstanding water pressure.
Underwater Photography and Detection:

Observation windows for underwater cameras, ROVs (Remotely Operated Vehicles), and AUVs (Autonomous Underwater Vehicles). The hemispherical design provides a near 180° wide field of view while withstanding water pressure.