Preparation method of bismuth-containing paramagnetic Faraday optical rotation glass

The invention discloses a preparation method of bismuth-containing paramagnetic Faraday optical rotation glass. The preparation method comprises the following steps of: firstly, uniformly mixing Er2O3, Bi2O3, B2O3, Al2O3, SiO2, Sb2O3 and ZrO2 to obtain a batch; secondly, fusing the batch to obtain molten glass, dropping the molten glass into a graphite mould, thermally insulating at 550 DEG C for 3 hours, and cooling to room temperature to obtain the bismuth-containing paramagnetic Faraday optical rotation glass. According to the invention, the bismuth-containing paramagnetic Faraday optical rotation glass is prepared by adopting a fusing and pouring method, owing to bismuth oxide with large molecular weight and low melting point, a forming range of the glass is expanded and the fusing temperature is reduced. The prepared Faraday magneto-optical glass has high content of rare earth erbium oxide, excellent glass forming property, remarkable Faraday effect and large Verdet constant, and the test sample has high light transmittance in a visible light range, and excellent heat stability and chemical stability. The preparation process has the advantages of simple operation process, low founding temperature, small high-temperature viscosity in the glass fusing process, short fusing time, excellent forming property, low cost, energy conservation and environmental friendliness and is suitable for industrial production.