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Article Abstract
Birefringent crystals are essential optical materials for polarized light modulation, yet few exhibit both large birefringence and broad transparency in the mid- to far-infrared (MIR-FIR) regions. Here, we report the successful synthesis of an inorganic birefringent crystal, CsICl (), by incorporating the highly anisotropic linear ICl birefringence-active group (BAG) with a heavy Cs cation under hydrothermal conditions. The large polarization anisotropy, perfect alignment, and dense packing of ICl endow with record-high birefringence values in both the visible (Δ = 0.994 at 546 nm) and infrared (Δ = 0.719 at 1064 nm) regions among all known inorganic crystals with > 2.0 eV. also exhibits an ultrawide optical transparency window from 0.367 to at least 25 μm and can be grown into centimeter-scale single crystals. This study introduces as a promising IR birefringent material and highlights the potential of linear interhalogen BAGs for the design of next-generation IR optical crystals.
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