Nonlinear Optical Materials: The Next‐Generation of Nonlinear Optical Materials: Rb 3 Ba 3 Li 2 Al 4 B 6 O 20 F—Synthesis, Characterization, and Crystal Growth (Advanced Optical Materials 23/2017)

In article number 1700840 , structural evolution from KBe 2 BO 3 F 2 (KBBF) to Rb 3 Ba 3 Li 2 Al 4 B 6 O 20 F is shown by James M. Rondinelli, Shiv Halasyamani, and co‐workers. Through the judicious selection of cations, the layered crystal structure of KBBF is “transformed” to three‐dimensional Rb 3 Ba 3 Li 2 Al 4 B 6 O 20 F. The 3D nature of Rb 3 Ba 3 Li 2 Al 4 B 6 O 20 F enabled us to grow large single crystals and determine that the material is nonlinear‐optically active with a birefringence of 0.057 at 1064 nm and a Type I phase‐matching limit of 243 nm. This suggests Rb 3 Ba 3 Li 2 Al 4 B 6 O 20 F may be used to generate 266 nm radiation.