Abstract

AbstractNonlinear optical crystals with ferroelectricity, which could realize ultraviolet/deep‐ultraviolet coherent output by the quasiphase matching technology, are expected to be promising candidates for the new type of ultraviolet/deep‐ultraviolet nonlinear optical materials. Here, a new borosilicate crystal, LaBSiO5, is found, which is superior to the famous commercial quasiphase matching crystals, LiNbO3, KTiOPO4, and LaBGeO5 in performances. LaBSiO5 crystal exhibits excellent optical and electrical properties, including a short absorption cutoff (186 nm), a moderate second‐harmonic generation response (≈1.1 × KH2PO4), and the ferroelectric polarization reversal (coercive field ≈ 36.98 kV cm−1, remnant polarization ≈ 1.83 µC cm−2). Besides, no layering tendency is found during the process of crystal growth. Therefore, LaBSiO5 crystal is a potential ultraviolet quasiphase matching material.

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