Second-order nonlinear optical (NLO) crystals functioning in the ultraviolet (UV) and deep-ultraviolet (deep-UV) regions are critically important as frequency conversion materials for all-solid-state UV laser devices. In this review, we focus on recent studies of inorganic UV and deep-UV NLO crystals with wide UV transparency and SHG efficiency. Following an introduction describing crystal-design strategies for UV and deep-UV NLO materials, the manuscript is organized according to the type of inorganic anions (borates, carbonates, nitrates and phosphates). Special attention is given to the crystal structures, second-order NLO properties, and structure–property correlations. The concluding remarks highlight future prospects in the field, with emphasis on the superiority of the different types of UV and deep-UV NLO crystals and the importance of large-size crystal growth for practical application in electro-optic devices.

作为用于全固态UV激光设备的频率转换材料，在紫外线（UV）和深紫外线（deep-UV）区起作用的二阶非线性光学（NLO）晶体至关重要。在这篇综述中，我们专注于具有广泛的紫外线透明度和SHG效率的无机紫外线和深紫外线NLO晶体的最新研究。在介绍了用于UV和深紫外NLO材料的晶体设计策略的引言之后，根据无机阴离子的类型（硼酸盐，碳酸盐，硝酸盐和磷酸盐）对手稿进行了组织。特别注意晶体结构，二阶NLO性质以及结构-特性相关性。结束语强调了该领域的未来前景，