Optical fibers have optical plastics, quartz glass, etc.
Fiber optic cable is a lot of fiber optic fibers together enough to become a wire
With the telephone wire is copper wire, telephone line is a lot of wrapped with insulation of the telephone wire, Oh
optical plastics
Plastics used as optical dielectric materials
Plastics used as optical dielectric materials.
Plastics used as optical media materials. Mainly used in large quantities of optical instruments, for the manufacture of optical substrates, lenses, contact lenses, organic optical fiber. Has been applied to the main optical plastics: ① polymethyl methacrylate (PMMA). Commonly known as plexiglass. Its optical transparency, optical stability, resistance to cracking, water absorption and other properties are better, is a more widely used optical plastics. ② Methyl methacrylate and styrene **** polymer (NAS). Containing about 70% polyacrylate, 30% polystyrene, refractive index according to its composition changes (1.533 ~ 1.567), can be machined, polished, injection molding, good optical stability. ③Polycarbonate (PC). Good performance in a wide temperature range (-137 ~ 120 ℃), suitable for outdoor use, refractive index of 1.586, impact resistance, durability; but not easy to machine and polish, higher prices. ④ Methylpentene polymer (TPX). Optical properties similar to acrylics, refractive index of about 1.467, good toughness, not easy to wear and tear, chemical resistance, good electrical properties; but its molding shrinkage. ⑤Nylon (Nylon). Refractive index 1.535, solvent and chemical reagent corrosion resistance, high strength, good electrical properties. Disadvantages are easy to absorb water, two-dimensional stability is poor, expensive. ⑥ ADC plastic (CR-39). Good optical transparency and corrosion resistance, impact resistance, continuous operating temperature of 100 ℃, short-term use temperature of 150 ℃; disadvantages are high shrinkage, expensive. In addition, there are polystyrene, styrene acrylonitrile **** polymer and so on.
Quartz glass is composed of a single component of silica glass. This glass hardness can be up to Moh's VII, low coefficient of expansion, high temperature resistance, chemical stability, electrical insulation are relatively good, in addition to hydrofluoric acid, hot phosphoric acid, in addition to the general acid has a good acid resistance. Transparent quartz glass has good ultraviolet transmission properties and optical properties. Used in the manufacture of optical instruments, electrical equipment, medical equipment and high temperature corrosion-resistant chemical instruments. High purity quartz glass can be made optical fiber.