High quality quartz sand is the main material. Appropriate addition of excipients. Due to its high refractive index, low dispersion and good chemical stability, rare earths can be used to produce optical glass for the manufacture of lenses for advanced optical instruments such as advanced cameras, camcorders, and telescopes. For example, a bismuth glass containing yttrium oxide lao360% and boron oxide b2o 340% with excellent optical properties is an indispensable optical material for manufacturing lenses for advanced cameras and lenses for periscope. In addition, radiation-proof glass can be produced by using the radiation-proof characteristics of some rare earth elements.
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