Deep-ultraviolet(deep-UV)birefringent crystals capable of generating or modulating deep-UV polarized lights are essential for modern laser technologies.However,there are few commercial deep-UV birefringent crystals,ex...Deep-ultraviolet(deep-UV)birefringent crystals capable of generating or modulating deep-UV polarized lights are essential for modern laser technologies.However,there are few commercial deep-UV birefringent crystals,except MgF_(2),which exhibit a tiny birefringence of 0.012@532 nm.Herein,by incorporating multiple alkali/alkaline-earth metal elements,the first tri-alkali/alkaline-earth metal fluorophosphate KBaSr(PO_(2)F_(2))(PO_(3)F)_(2)(KBSPF)with the coexistence of(PO_(3)F)^(2-) and(PO_(2)F_(2))^(-)has been successfully synthesized using the hydrothermal method.Experimental results indicate that KBSPF not only shows a wide transparency window down to the deep-UV spectral region,but also exhibits a relatively large birefringence of 0.042@550 nm,exceeding those of commercial MgF_(2) and most alkali/alkaline-earth metal phosphates or fluorophosphates.Theoretical calculations reveal that(PO_(3)F)2-and(PO_(2)F_(2))^(-)anions are responsible for the optical properties of KBSPF.Our work not only provides a promising deep-UV birefringent crystal but also offers new insights to enrich the solid-state chemistry of fluorophosphates.展开更多
基金financial support from the National Natural Science Foundation of China(22193042 and 22405273)the Natural Science Foundation of Fujian Province(2022J02012)+2 种基金the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences(ZDBS-LY-SLH024)the Postdoctoral Fellowship Program of CPSF under Grant Number GZB20240747the China Postdoctoral Science Foundation(2023M743498).
文摘Deep-ultraviolet(deep-UV)birefringent crystals capable of generating or modulating deep-UV polarized lights are essential for modern laser technologies.However,there are few commercial deep-UV birefringent crystals,except MgF_(2),which exhibit a tiny birefringence of 0.012@532 nm.Herein,by incorporating multiple alkali/alkaline-earth metal elements,the first tri-alkali/alkaline-earth metal fluorophosphate KBaSr(PO_(2)F_(2))(PO_(3)F)_(2)(KBSPF)with the coexistence of(PO_(3)F)^(2-) and(PO_(2)F_(2))^(-)has been successfully synthesized using the hydrothermal method.Experimental results indicate that KBSPF not only shows a wide transparency window down to the deep-UV spectral region,but also exhibits a relatively large birefringence of 0.042@550 nm,exceeding those of commercial MgF_(2) and most alkali/alkaline-earth metal phosphates or fluorophosphates.Theoretical calculations reveal that(PO_(3)F)2-and(PO_(2)F_(2))^(-)anions are responsible for the optical properties of KBSPF.Our work not only provides a promising deep-UV birefringent crystal but also offers new insights to enrich the solid-state chemistry of fluorophosphates.
