What is a spherical lens?

  Spherical lens is an important optical element, mainly made of optical glass and other materials, used for the coupling between optical fibers, between laser and optical fibers, and between optical fibers and detectors, or for the collimation of optical fiber beams in thin film filtering dense wavelength division multiplexer, occupies an important position in optical systems. Spherical lens is also called glass beads. It is a solid or hollow glass bead with a diameter of several microns to tens of microns. Its production began in the United States before World War II, and later, European countries began industrial production one after another. The varieties and specifications are increasing day by day, and the application fields involve various departments such as chemical industry, military industry, aerospace, transportation, petroleum, light industry, and medical treatment.