“…Birefringent crystals, as significant photoelectric functional materials, have played a crucial role in modulating and detecting the polarization state of light and found widespread applications in laser polarization technology, optical communication, polarizing information processing, etc. − Over the past few decades, several birefringent materials, such as MgF 2 , YVO 4 , TiO 2 (rutile), and LiNbO 3 , − have achieved commercial success. However, these renowned birefringent crystals have their own limitations that hinder their practical applications.…”