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Br demonstrated exceptional birefringence (0.26 at 546 nm), setting new performance benchmarks among KBBF analogs. Theoretical analyses reveal that these superior properties arise from the efficient alignment and high density of self-polymerized functional units. This work represents a significant advancement in the design of high-performance UV NLO materials, particularly for fourth-harmonic generation, and paves the way for future innovations in photonic technologies, including solar-blind UV laser systems and advanced photonic devices.
Zeng et al. (Mon,) studied this question.