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Off-center: The material NaI3O8 is obtained as millimeter-sized single crystals (see photograph of a single crystal; crystal size: 2×2×5 mm3), and its crystal structure is acentric. It is transparent up to 12.5 μm, thus covering the three atmospheric transparency windows. It generates an intense second-harmonic-generation signal and has a high optical damage threshold.
Phanon et al. (Tue,) studied this question.
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