Kunshan Nori Optics Introduction: The basic properties of optical lenses

Optical glass is a kind of inorganic glassy material that transmits light through refraction, reflection and transmission or changes the intensity or spectral distribution of light through absorption, which is mainly divided into colored optical glass and colorless optical glass. Optical glass can be used to manufacture lenses, prisms, mirrors and instrument Windows in optical instruments.

Optical glass is mainly used in various specifications of cameras, binoculars, high-performance mobile phone displays and other glass parts. Therefore, optical lenses have become an essential part of the machine vision system, which directly affects the quality of imaging. Therefore, the choice of optical glass material is very important.

Kunshan Nuoli Optical Lens manufacturer to explain to you about the basic properties of optical glass:

1. Refractive Index

The refractive index is the ratio of the speed of light in a vacuum to the speed of light in a given material - an indication of how the speed of light slows down as it passes through an optical material. The refractive index of optical glass, nd, is specified at a wavelength of 587.6nm (helium D-line). Materials with a low refractive index are often called "crown glass", while materials with a high refractive index are called "flint glass".

Second, dispersion

Dispersion is the phenomenon that the refractive index changes with wavelength. Using the Abbe value, vd is defined as (nd-1)/(nF-nC); nF and nC are refractive indices at 486.1nm (hydrogen F line) and 656.3nm (hydrogen C line), respectively. A low Abbe value indicates high dispersion. Crown glass is usually less dispersive than flint glass.

3. Transmittance

Standard optical lens glass provides high transmission across the entire visual spectrum and in the near ultraviolet and near infrared ranges. Crown glass usually has stronger transmission in NUV than flint glass.