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氟化物玻璃作为一类新型光学材料,具有理想的光学性质和良好的物理化学性能:透光范围宽、透过率高、折射率低、色散小、非线性折射率低、化学稳定性好等。其理论损耗可达10~(-3)dB/km(～3—4μm),在 n_b-v 关系图中占有一个特殊的位置~([1])。但是,实现氟化物玻璃光纤的应用,其杂质水平要求达到 ppb 级,而原有的熔制工艺远达不到质量要求。玻璃中含有大量外来杂质:如过渡金属、稀土元素、水(或 OH基团)以及气泡、条纹、含氧微晶颗粒等缺陷。这些杂质和缺陷增加了玻璃的光吸收和光散射,严重影响了玻璃的透光性能,使其应用受到限制。
As a new type of optical material, fluoride glass has the ideal optical properties and good physical and chemical properties: wide transmission range, high transmittance, low refractive index, small dispersion, low nonlinear refractive index and good chemical stability . The theoretical loss can reach 10-3 dB / km (~ 3-4μm), occupying a special position ~ ([1]) in the n_b-v graph. However, to achieve the application of fluoride glass fiber, the level of impurities required to achieve ppb level, while the original melting process falls far short of the quality requirements. Glass contains a lot of foreign impurities: such as transition metals, rare earth elements, water (or OH groups) and bubbles, stripes, oxygenated crystallite particles and other defects. These impurities and defects increase the light absorption and light scattering of the glass, seriously affecting the light transmission properties of the glass, making its application limited.