标题：β-BaB2O4 with special cut-angle applied to single crystal cascaded third-harmonic generation
作者机构：[任宏凯;王正平;吴志心;王梦霞;孙玉祥;孙洵;许心光]State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.;[任宏凯;王正平;吴 更多
通讯作者地址：[Wang, Z.-P] State Key Laboratory of Crystal Materials, Shandong UniversityChina;
关键词：Frequency conversion; Nonlinear optical crystals; Optical frequency converters; Polarization; β-BaB2O4 crystal
摘要：High-efficiency single crystal cascaded third-harmonic generation (THG) was realized in β-BaB2O4 (BBO) material with special cut-angle. By analyzing effective nonlinear optical coefficient (deff) of the cascaded THG process, which was composed by type-II frequency doubling and type-I sum-frequency, the optimum phase matching (PM) direction in BBO crystal was determined to be (θ = 32.1°, φ = 11°). With an optimized 9-mm long sample which was processed along this direction, the highest cascaded THG conversion efficiency reached 42.3%, which is much superior to the similar components reported previously, including ADP, KDP, and GdxY1-xCOB crystals. © 2018 Chinese Physical Society and IOP Publishing Ltd.