Symmetric Bi₂O₂S design of S one-dimensional photonic crystal and its application in picosecond fiber laser

In this paper, the S-based compound Bi2O2S with abundant reserves is proposed, and the first-principle calculation determines its good optical properties. In order to further prove our conclusion, a high-performance symmetrical one-dimensional photonic crystal is designed with a defect layer by COMSOL. It is applied to a linear cavity fiber laser to realize ultrashort pulse output.