Name: Half Ball 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.

Drawing

Specification of Half Ball Lens

Items	Parameters
Material	optical glass (VIS glass, UV fused silica, Silicon, sapphire etc.)
Diameter	0.2mm-100mm
Diameter Tolerance	+0.0-0.05mm
Surface Qualty	60/40, 40/20.20/10
Surface Frigure	lambda/2~lambda/8
Coating	According to customer requirements.

Typical Application Areas

High-efficiency Optical Coupling

Utilizing an extremely short back focal length, the distance to the optical fiber or laser chip is minimized, efficiently focusing or coupling diverging signal light into the transmission fiber.
Beam shaping and illumination

Diffusion of the LED point light source into a uniform surface light source achieves wide-angle uniform illumination. For example, in intraoral scanners, it eliminates reflective interference from tooth surfaces, ensuring the accuracy of 3D modeling.
Specialized Imaging and Detection

As a solid immersion lens or coupling lens, it improves the resolution or signal acquisition efficiency of the imaging system. For example, in terahertz systems, it is used to increase the intensity and bandwidth of the spectral signal.