Research Advance in Several Long-wavelength Infrared Low Refractive Index Materials
几种长波红外低折射率材料的研究进展

The physical properties of several long-wavelength infrared low refractive index materials, such as gadolinium oxide, erbium fluoride, zinc fluoride, indium fluoride and polyethylene were discussed in this paper. The preparation progress of these materials was summarized and the optical properties of these materials were reviewed. All of these materials will be the potential long wavelength infrared low refractive index materials in the future. However, further research would be prerequisite if these materials are applied in the design and manufacture of infrared filters.