Tantalum oxide shows a wide spectral range of high transparency. It can be used as high refractive index material.
Niobium oxide has higher refractive index than tantalum oxide.
Tantalum and niobium oxide can be used in antireflective coatings for lenses. Relatively high impurity levels of heavy metal ingredients can degrade thin film properties.
These impurity levels are controlled in production and analyses process by Entekno.