What kind of material is the optical element

Optical media. All optical parts are made of optical media, which is a substance that occupies a certain volume and transmits optical radiation. Air, glass crystals, plastics, liquids, and specialty media are all optical media. Colorless optical glass is the main material used in the manufacture of optical parts. According to the size of the refractive index and dispersion coefficient value, optical glass can be divided into two categories: crown glass and flint glass, and there are many models. China's optical glass name symbols such as: crown glass is divided into, light crown (QK), crown (K) phosphorus crown (PK), barium crown (BaK), heavy crown (ZK), lanthanum crown (LaK), crown flint (KF) and so on. Flint glass is divided into: light flint (QF), flint (F), barium flint (BaF), heavy barium flint (ZBaF), heavy flint (ZF), lanthanum flint (LaF), special flint (TF), etc.

Optical parts, also known as optical components. The basic building blocks of an optical system. Most of the optical parts play the role of imaging, such as lenses, prisms, mirrors, etc. In addition, there are some parts that play a special role in the optical system (such as spectroscopy, image transmission, filtering, etc.), such as reticles, filters, gratings for optical fibers, etc. Holographic lenses, gradient refractive index lenses, binary optical elements, etc., are new optical components that have emerged in the past two decades.