The raw materials for producing optical glass are some oxides, hydroxides, nitrates and carbonates, and phosphates or fluorides are introduced according to the requirements of the formula. In order to ensure the transparency of glass, the content of colored impurities must be strictly controlled, such as iron, chromium, copper, manganese, cobalt, nickel, etc. It requires accurate weighing and uniform mixing during batching. The main production processes are smelting, forming, annealing and inspection.
①Smelting 　Single crucible batch melting method and pool kiln (see kiln) continuous melting method. Single crucible melting method can be divided into clay crucible melting method and platinum crucible melting method. No matter what kind of smelting method is used, it needs to be stirred with a stirrer, and the temperature and stirring are strictly controlled to make the optical glass glass liquid reach a high degree of uniformity.
②The forming methods of forming optical glass include classical crucible method, rolling method and casting method, but currently, leak forming is more and more widely used (using a single crucible or continuous melting out of the liquid), which can directly pull the rod or drip Pressing or leaking to form large-sized blanks, improving the utilization rate of the material drop and the yield rate.
③ Annealing 　 In order to maximize the elimination of the internal stress of the glass and improve the optical uniformity, a strict annealing system must be formulated to carry out precision annealing.
④Indications measured by inspection 　 are: optical constant, optical uniformity, stress birefringence, stripes, bubbles, etc.